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  #97  
Old 02-13-2014, 09:02 PM
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2014 GC diesel. Mostly hwy...I drive 50k a year. Took a chance and jumped from Japanese to American brand. Love my GC so far. Very refined.

Had GC for 2 weeks and 2000 miles. Avg 26mpg. I DO NOT drive at 60. I cruise at 75-80 then slow on back roads.

I'll post more as I spend time with new GC. I hope it holds up like my last 2 infinities, Acura and Lexus.
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  #98  
Old 02-14-2014, 09:11 AM
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Re: Miles per Gallon

I do not know all the technical aspects of back pressure etc but I do know that an engine is pretty inefficient at converting energy to power. If I recall correctly it is in the 30 or 40% range.

While gas engines might have better engine braking my experience is different. I have a GMC Envoy and now a GC. Before the GC I also had a Jetta TDI. I hated driving the Envoy because of how it would race away on downhills and if you were coming up on a slower vehicle you had to brake.

With the TDI and now this vehicle when I come over a hill I take my foot off the pedal and on the types of hills you find on a highway I either maintain my speed or lose some. Coming to a stop sign I let the engine slow me down. On one more steep country road the GC is even better than the TDI that would accelerate so that I had to use the brake some so I was not going way over the speed limit. I still need to brake but less so.

I had the original brakes on the Jetta when I sold it at 86K miles and I think that is mostly do to the fact that on my commute I mostly used my brakes at stop signs and lights and only at the end when the engine had slowed the vehicle considerably.
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  #99  
Old 02-14-2014, 10:48 AM
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Engine braking is inherently better on similar sized gas engines vs diesel...that's a physical fact....but...transmission programming determines how it is utilized unless you manually downshift. The transmission programming on the GC is designed to use engine braking. It will downshift and keep the torque converter locked to maximize engine braking. Other vehicles (most) will coast as efficiently as possible for economy and you have to manually downshift to engine brake.
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  #100  
Old 02-18-2014, 11:53 AM
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Re: Miles per Gallon

Haven't posted for a while but saw this thread and thought I would add my mileage update. Up to 6250 miles on my ecodiesel. My calculated mpg has been down between 21-24 lately. I think the weather has been the biggest impact on mpg for me. Temps have been between -25F and 25F regularly with lots of wind. My jeep is running great but working harder to do so.
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  #101  
Old 02-18-2014, 05:56 PM
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Re: Miles per Gallon

I just signed up for the forum as i am interested in buying a GC Limited diesel. I was debating between the V8 and the diesel and will most likely get the diesel as the price is not too much more. Im glad to see you guys getting some pretty decent mileage. Im tired of my 4runner that gets 14mpg
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  #102  
Old 02-18-2014, 08:13 PM
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Quote:
Originally Posted by xatez View Post
I just signed up for the forum as i am interested in buying a GC Limited diesel. I was debating between the V8 and the diesel and will most likely get the diesel as the price is not too much more. Im glad to see you guys getting some pretty decent mileage. Im tired of my 4runner that gets 14mpg
I came from a Nissan Armada. I'm loving the MPG. You will too. I'm looking forward to the summer fuel blend.
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  #103  
Old 02-18-2014, 08:36 PM
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Re: Miles per Gallon

Summer blend should raise milage 20-30%.
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  #104  
Old 02-18-2014, 11:24 PM
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Re: Miles per Gallon

Just calculated that my most recent tank was 17.9 MPG, probably 95% of that tank in the city. The majority of those mornings were in the single digits, plus I was doing a lot of remote starts to get things warm for a few minutes before hopping in. Overall average with 1250 miles on the odometer is 19.1 MPG.

Considering this vehicle is far from being broken in along with winter blend diesel, high number of city miles, short commutes, plus the cold...yeah, pretty close to what I was expecting. My '09 VW Touareg V6 TDI is averaging between 20-21 MPG right now driving all city miles too, so both vehicles are fairly close.
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  #105  
Old 02-19-2014, 12:04 AM
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I've been paying attention to fuel flow at idle at various engine temperatures. Cold starts below 20F show 0.85 gallons per hour while warm idle is 0.28 to 0.32 gph. The gph drops as oil temperature rises. The GC diesel uses 4 times the fuel at idle when cold. Also, the transmission is less efficient when cold. Maybe the block heater would reduce fuel consumption based on how rich the engine runs when cold and the time it takes to warm up?

Also, for you guys making short commutes at low speeds….does anyone have the Android "Torque" app or a Scanguage II? Monitoring the Catalytic Converter temperature will show when the DPF is in regen cycle. If you rarely drive fast, it may be possible that the regen cycle never finishes. Fuel flow is increase when regening....a 3-4 mpg decrease.
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  #106  
Old 02-19-2014, 09:49 AM
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Re: Miles per Gallon

I am just making an observation but it seems as if the MPG drops a good bit when the temps go into the low 20's and below. One week it rarely even hit 20 and it was difficult to cruise on the level and get the instantaneous readout to be in the 20's. Today it is almost 30 and going up a long hill on the interstate I was able to keep it around 26. My average as per the readout for the week is around 27 and last week when it was cold and I drove it with about the same mix of city/highway miles I was around 24. I also noticed that when the engine is cold the instantaneous readout when coasting down a grade could is not 99 but down around 10 or 15.

I am a little bit confused why the GC would get such awful mileage when it is really cold. I do not recall my Jetta experiencing this and wonder if crn3 sees a big drop in his Toureg when it gets really cold out.

Might be an incentive to plugging it in next year. Wish the set up to use the engine block heater was configured to make it easier to use.
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Old 02-19-2014, 12:37 PM
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Quote:
Originally Posted by raptor5618 View Post
Might be an incentive to plugging it in next year. Wish the set up to use the engine block heater was configured to make it easier to use.
An short extension cord can be fashioned to extend the heater plugin to a location that is more accessible. I would recommend using a plug that has a rubber cap to cover it when not in use if you locate it under the bumper or in a wheel well. The winter road crud can clog it up pretty easily.
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  #108  
Old 02-19-2014, 01:56 PM
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Re: Miles per Gallon

Quote:
Originally Posted by raptor5618 View Post
I am a little bit confused why the GC would get such awful mileage when it is really cold. I do not recall my Jetta experiencing this and wonder if crn3 sees a big drop in his Toureg when it gets really cold out.
I have religiously kept mileage records since 2011 and have not noticed a considerable difference in mileage on my Touareg between winter and summer. During some of the coldest weather we were having the last few weeks actually gave me a slight bump in mileage. The main reason why I probably don't see much difference is that the Touareg is always parked in my heated garage overnight:

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