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Miles per Gallon

22K views 114 replies 47 participants last post by  raptor5618 
#1 ·
I guess coming from a TDI and the TDI forum I will always have a fascination with squeezing as many miles out of a gallon as I can. I still have not found the best methods for doing that yet but I am really impressed that on a long uphill climb I was able to maintain my speed and watch the screen say that my usage was in the upper 20's. Now I was not going 70 miles and hour but the power of this vehicle is pretty incredible.

The dealer filled the tank but I wanted to be sure that I was able to track my MPG based on how I fill the tank. Seems as if with this one, when the nozzle clicks you are pretty much full. With my previous vehicle you could put in almost one more gallon.

So with a brand new engine running mostly highway miles on a trip that started at probably close to sea level and went uphill to the final destination was 28.37 based on miles driven and gas put into the tank. There was some city driving but not all that much. Given that it is a new engine and using winter fuel I was pretty surprised.

With my TDI the mileage improved as the engine broke in and it always dropped some in the winter time. So far on screens that show MPG I still am showing 28+. My experience is that these screens are usually more optimistic than what you get when you calculate MPG but I think I am going to like the mileage I get. I was very worried coming from a vehicle that averaged 40 MPG.

I know most people here are more interested in power and acceleration than efficiency but I thought there might be a few who are thinking about buying and wonder about what mileage they might get. Oh I am in NE PA so on my 100 mile daily commute I rarely am on the level. Always going up or down.
 
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#2 ·
I haven't been super on top of keeping track of my mileage. But I to am up and down a lot throughout the week. I've found that at an average speed around 50-55mph my Jeep says it get anywhere from 24-28mpg, when I calculate the mileage it seems to be 25-29ish. So basically mine seems to be reporting pretty darn close.
 
#3 ·
I commute 18 miles (short run) through the mountains of MD. A short mountain commute is not the best for mpg, I know. But it is what it is.

My Summit has 2300 miles on it now. Highway miles MD to FL, cruise set between 70-80, it gave me nearly 29 round trip, brand new. I started that trip with 250 miles on the odometer.

Commuting was giving me 21 or so. But yesterday morning I upped my tire psi from 35ish to 40 all around - and the trip odometer as of today's lunch run showed 23.1 avg.
 
#4 ·
I like to squeeze max mpg out of every vehicle I own. My SuperDuty would run 19.1 to 17.5 except winter when it would drop down 30% from those numbers. I am fully expecting to see 28mpg on the interstate and around town in the 20's. This is going to be a fantastic vehicle and I hope just the beginning of auto makers bringing more diesels to the US. New Titan gets a Cummins diesel for 14 which is encouraging as well as the 15 Colorado getting a diesel too...
 
#6 ·
I've been getting 19 - 20 mpg with mostly city driving in Denver. Also, my oil life is down to 40% at 2,000 miles, already added a quart of oil.
 
#7 ·
I've put 4600 primarily highway miles on my Jeep since early Dec. I'm driving in Central IL where the temp has been less than 30. I run non-bio diesel with winter additives without cetane boost.

My average fuel economy initially increased by one mpg with each fill-up from 23 to 27 mpg, where it has plateaued. I usually set my ACC to 72 mph and go. Although I did avg. 31 mpg on a 650 mile trip when I was driving 55-65 mph. Needless to say, I'm estatic!
 
#8 ·
Our 2008 CRD got around 21 - 22 MPG on our normal daily commute with a mix of city and freeway (55 MPH) driving.

The EVIC on our new ecodiesel shows an average of 25.9 MPG and I'll do my 2nd fill-up in the next day or two to hand calculate. Part of our drive is a level 45-MPH street and the instantaneous MPG goes as high as the mid 30s according to the EVIC.
 
#16 ·
Just got my first chance to calculate mileage between my first two trips to the fuel station.

Hand calculated was 26.0 MPG and the EVIC was surprisingly close at 25.7. Our 2008's EVIC was usually about 1 MPG too low.

I left the eco mode on and only used the sport mode maybe 5% of the time.
 
#9 ·
I'm averaging 25-26 with a mix of city and highway. My last two combined fill ups as I only added 10 gallon locally and drove for another week.....as I like to buy it in the next town over where is 23 cents a gallon cheaper. Between the two fuel stops I used 27.3 gallons and I drove 738 miles which equals 27.03MPG hand calculated..I know as I get it broken in and the summer temps and fuel get here I'll get 30 or almost 30.....I'm more than satisfied :thumbsup:
 
#10 ·
Wow that really sounds great. I drive mostly highway and even off highway is on roads where I probably get decent MPG because there is not a lot of stop and go. I think that on Friday when I fill up I will be over 28 again. If I hit 29 like it says on the trip odometer I would be thrilled. Like you said I am now thinking that 30 in the summer is very possible. One of my main concerns was that I would be spending a lot more on this than on the Jetta. I knew that it would be more but figured that if was close to 28 it would not be a killer to my budget. I was hoping that it was not going to be 26 or 25.
 
#11 ·
IMO guys only use math at the pump for mileage. It can be interesting to see how well the electronics have done especially if they consistently repeat themselves because then you can make a reasonable if not entirely accurate estimation of consumption on the fly. Mine has been over twice and under once so obviously I cant make much out of that.

Mine btw just did a suspiciously good 24.06 in nearly all town driving. Gonna have to repeat that before I can buy into it.
 
#14 ·
start/stop isn't as easy on a diesel as it is on a gasser.

Look at how long it took to get a decent remote start system for a diesel...
 
#17 ·
I will find out tonight or tomorrow how close it is to what I EVIC (not sure what this means) says. Everyday it was going up by 3 or 4 tenths and today when I got to work I was at 30.2. I get better mileage on the ride home so I guess it will be solidly in the 30's. By that I mean I do not think I can get it much higher but I think that the more miles you have in the plus 30's the more likely it is that it will stay there. Maybe I totally do not get where this number comes from but so far it seems to be fairly consistent from what I saw on the TDI.

Of course I am going to pass out when I see how much more it is going to cost me that when I commuted with the Jetta. I do like the range though because it is showing over 200 miles left and I am very close to 450 and more than a quarter tank left so I can easily get more than one weeks commute out of a tank of gas.

VW talked about building a diesel hybrid and they had prototypes and if I am not mistaken they were saying that it would be for sale in the next year or two so the start stop of a diesel is possible. The power to turn over a diesel is far more than a gas engine so I think that you would need to have a massive battery to start and restart the engine. The battery was significantly larger and more expensive than on a gas vehicle and on a very cold day you still could hear it strain to turn the engine over.
 
#18 ·
VW talked about building a diesel hybrid and they had prototypes and if I am not mistaken they were saying that it would be for sale in the next year or two so the start stop of a diesel is possible. The power to turn over a diesel is far more than a gas engine so I think that you would need to have a massive battery to start and restart the engine. The battery was significantly larger and more expensive than on a gas vehicle and on a very cold day you still could hear it strain to turn the engine over.
I've always wondered why it seems no one has tried a diesel-electric more like the marine versions used in ships and subs and such, where the actual drive motor is strictly electric and the diesel is used to keep the battery charged. It lets you run the diesel at the optimum RPMs, and it would avoid the constant start/stop of the engine.

Now obviously you need two complete engines, but it doesn't seem that different than current hybrids. Tesla Motors has already shown that we can get good pure-electric motors. You wouldn't need as much battery power as a normal pure-electric because it can recharge from the diesel at any time.

Anyway, obviously there's some engineering/design reason why it's not a good solution or we'd have seen them by now. It just always struck me as a potentially good solution, especially for the larger vehicles like SUVs, pickups, etc.
 
#19 ·
Batteries are HEAVY, and our WK2's already weigh in north of 5500 lbs.

And they're *just* diesel.

For hypermileing...drive with the instant fuel economy display showing in the EVIC. If nothing else, that will help you learn where, along your commute, X throttle pressure equals the best MPG.
 
#21 ·
After 5900 miles my best milage, 32 mpg averaging 60mph all highway.
My worst, 19 mpg towing a 6600 lb Airstream from Las Vegas to Pasadena and back. My overall average, 26 mpg using winter blend diesel and snow tires.
 
#23 ·
Diesel electric boats do not normally use batteries for propulsion. They run a series of motors to produce electricity which then power electric motors and other demands. The saving comes in by putting engines online as required to meet power demands which could range anywhere from keeping stand down lights on to vessel propulsion at full commanded throttle along with vessel specific users such as refrigeration for holds, house power (Everything you have in your home must be created on a boat, want the toilet to flush a pump must pump water into it, etc), accessories such as fans for the engine room. These accessories use substantial power, it takes for instance 200 hp off the engines just to power the fans driving air into the engine room on my boat.

At any rate I think its safe to say that such systems would not be suitable in a passenger car. You would be looking at something along the lines of the Volt which always runs of its batteries which are charged either by the main engine or shore power.
 
#24 ·
For those that want an accurate hand calc consider using a smartphone app to do the math and keep track of results. I use the road trip app for iPhone which is super easy. Every fill up just enter current miles on the odometer and gallons to fill. Can also enter total price if you want history of price per gallon.

https://itunes.apple.com/us/app/road-trip-mpg-mileage-fuel/id298398207?mt=8
 
#25 ·
Well, the results on my stock 2014 (factory Fortera tires) aren't comparable.

I have been averaging 21 MPG on interstate driving using "premium diesel" (ie. Cenex Roadmaster XL and KwikStar Premium Gold). I get 17 to 19 MPG in town.

This is somewhat worse mileage than I experienced with driving a rental 2013 Limited V6 approximately 2,000 miles last summer.

I will probably go back to using BP regular diesel next refuel... I got ~24 mpg (interstate) on that.
 
#31 ·
What kind of premium diesel is that. I get diesel from a station that sells a lot of fuel but is not affiliated with any particular brand and I am getting over 28 going up and down the hills of NE PA. I did not check it during fueling this week when I did a lot of city driving right after a fill up but my trip meter that I reset when I fill up said I was at 21 and that was city driving.

From my experience with diesels, you really can save a lot by backing off on the pedal just a bit especially during the down hill portions. With all the torque you usually can maintain a good speed with less pedal. Also when accelerating it seems to me that I rarely push the pedal down very far. Does not seem to really add to your speed a great deal once you get past maybe 1/4 pedal. Perhaps I am overstating it but one of the things I really like about diesel engines is that unlike gas engines I do not think I ever found it necessary to put the pedal to the floor. Just very slight movements affect your speed far more than is the case with gas.

Right now I am using winter blend so I really do expect that my average is going to creep up if not over 30 MPG. I really would expect far better with premium diesel other than just paying more.
 
#26 ·
First nearly full tank MPG calculation. Computer said I was just over 29. Based on fuel pumped I had 28.55. I really topped it off so added a bit more fuel than first fill. Winter fuel and less than 1k on it so far means I am really happy. I keep a spreadsheet of every fill and service I do on my vehicles so I always have an average for the life of the vehicle. Not a big deal but it helped me realize I had something bad going on when the MPG dropped more than could be explained by how I drove on the tank being measured.

I have been driving with the screen that shows instantaneous MPG but my experience with the TDI clued me in as to how to get better numbers. So far I am more than happy.
 
#28 ·
Per EVIC I'm at 21.9 mpg and that's with 75/25 city to highway driving over the last week and a half.

I'll probably have to fill up in a week or so and I'll be able to get a hand calc. Hopefully I'll be able to fill up over the 20 gallons that I put in last time. Was trying to be safe and not try to keep filling once the nozzle kicked off.
 
#32 ·
I just turned 4,000 miles over the weekend. 7 fill ups so far. Overall average is 23.31mpg. Best tank was 25.1mpg with city driving and the worst was 21.5mpg with super cold temperatures of that polar vortex and using 4 lo to pull out a stuck vehicle. I pulled an open bed snowmobile trailer with 2 snowmobiles Up North over the weekend and managed just over 20mpg on the highway at 78mph on the way up (up hill) and managed to get 22mph downhill on the way home. I am quite happy with the mileage so far as it is exceeding my 07 CRD Wk which I had modified. :thumbsup:
 
#33 ·
Stopped at a Marathon station last week. The truck was there filling the diesel. I asked the manager about the cetane level. We walked out to the truck. He did not know the cetane level, and it was not printed on his delivery paper work. He did say that in the twin cities, all diesel at all the stations comes from one of 2 refineries. So when I see the list in another thread that lists all kinds of cetane levels, it makes me wonder if it varies region to region. According to what I heard, around here, there should only be 2 cetane levels. I know Kwik Trip has a higher cetane levels than Super America or Holiday. Marathon said they get their fuel from the same refinery as Kwik Trip.
 
#35 ·
My limited has just about 4200 miles and my overall average is around 26. My daily commute is 48 miles each way, mostly 2-lane country roads (50-60mph). My best highway result was 32 driving back to NJ from Myrtle Beach (600+ miles). Averaged 31 on the way down. When not commuting and using only for short-trips I get around 22-23
 
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