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  #13  
Old 01-16-2014, 04:05 PM
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Re: Miles per Gallon

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Originally Posted by _Bryan_ View Post
I do about 50/50 driving (lots of city driving during the week, then put about 250 miles on the freeway on the weekends). I'm seeing only about 19mpg in the city, but a nice 27 or so on the freeway.
That's why Jeep should quickly add start/stop technology to the diesel. It would bump up those city numbers by a couple of MPGs.
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  #14  
Old 01-16-2014, 10:30 PM
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Re: Miles per Gallon

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...
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  #15  
Old 01-17-2014, 09:42 AM
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Re: Miles per Gallon

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Originally Posted by racer-xerols View Post
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...
Volvo has it on their diesel wagons in Europe (in COLD Sweden), and it works well. So it is doable.
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  #16  
Old 01-17-2014, 09:49 AM
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Re: Miles per Gallon

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.



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Originally Posted by Hammerhead View Post
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.
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Old 01-17-2014, 01:55 PM
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Re: Miles per Gallon

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.
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Old 01-17-2014, 04:00 PM
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Re: Miles per Gallon

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Originally Posted by raptor5618 View Post
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.
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Old 01-17-2014, 09:40 PM
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Re: Miles per Gallon

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.
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Old 01-17-2014, 09:52 PM
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Re: Miles per Gallon

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Originally Posted by nautiboy View Post
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.
While not diesel, isn't that the concept of the Chevy volt? The gas motor runs a generator, but doesn't move the car directly.

"While driving, after the Volt battery has dropped to a predetermined threshold from full charge, a small naturally aspirated 1.4-liter 4-cylinder gasoline fueled internal combustion engine (Opel's Family 0[57]) with approximately 80 hp (60 kW), powers a 55 kW generator to extend the Volt's range."



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  #21  
Old 01-17-2014, 10:41 PM
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Re: Miles per Gallon

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.
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Old 01-18-2014, 10:07 AM
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Re: Miles per Gallon

Google via motors


Quote:
Originally Posted by nautiboy View Post
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.
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Old 01-18-2014, 12:04 PM
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Re: Miles per Gallon

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.
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  #24  
Old 01-18-2014, 03:34 PM
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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...298398207?mt=8
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