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  #109  
Old 02-19-2014, 04:01 PM
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Re: Miles per Gallon

I will have to look at my records for the Jettas I had. The older one took a hit when winter fuel came into play, the newer one it was barely noticeable. I suspect the GC still does not get as good mileage when it is cold even when the engine in warm. I believe the VW's heated the fuel before it went into the engine, maybe that helped. I would suspect that the cold weather would make the engine more efficient, Air is more dense so more O2 and power is generated by the difference between the hot gas and the cold air it goes into so I think for gas engines they do run more efficiently when it is cold I believe I read.

Dense air more wind resistance?
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  #110  
Old 02-19-2014, 10:58 PM
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Mine gets nearly the same *instantaneous* mpg in extreme cold....once it is fully warmed up....but that doesn't happen on short trips. Keep in mind that I am in the South and our diesel isn't the same winter blend as you guys up North. The winter diesel and rich running warmup are the big mpg killers.
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  #111  
Old 02-20-2014, 08:45 PM
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Re: Miles per Gallon

I added up all my fuel fill receipts since I took delivery.

I'd say about 60-70% highway miles. I used remote start almost always for warm up, and sometimes a lot of idling in between stops

I drove 5765 miles on 257.287 gallons:

5765/257.287 = 22.4 mpg

total fuel cost: $1,090.52 for an average of $4.23 per gallon

average cost per mile: $0.1891

assuming my math and the odometer is correct, the only variable I think is the pump accuracy
and fuel grade/mix

Also, at about 1700 miles I installed Nitto Terra Grapplers in OEM optional size 265/50r20. I'm sure they have a little more rolling resistance but I have no idea how much they affect mileage. any ideas?
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  #112  
Old 02-24-2014, 07:10 AM
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Re: Miles per Gallon

I finally had a chance to put on some highway distance. It was interesting it took about 40 minutes for the transmission to get up to its stable temp of ~190 F, but I was still getting rather poor efficiency of 19 20 mpg @ 77 mph (25 F, clear conditions/road).

After approximately 80 minutes, efficiency "magically" jumped to 24+ mpg. My guess is that it was finished burning off the DPF because the conditions on the interstate didn't change (and this region is called the Great Plains for a reason).

The next day on the same run going the opposite way I got about 26 mpg once it warmed up, albeit doddering along at about 71 mph.

I should probably get a Bluetooth OBD dongle and link it with my Android tablet so I can report actual fuel consumption numbers like ExcursionDiesel does.
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  #113  
Old 02-25-2014, 09:49 PM
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Re: Miles per Gallon

I just went up to Copper Mountain (Colorado for those of you who don't know) from south of Denver, just about 210 miles round trip up and through the Eisenhower Tunnel. 23mpg on the way up and 32 on the way back. Verified by the EVIC and DASH connected to an OBD (they were identical). Obviously one way is mostly uphill and the way back is down hill. But compared to my 6cyl Ford Edge where I would routinely get 17mpg on the way up and 24 on the way down, I'm about as happy as I could be.

I should add that it was mostly 70-75 on the way up and 75-80 on the way down. Man does that transmission work great in the mountains and the diesel barely feels like it is working.
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  #114  
Old 02-27-2014, 11:48 PM
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Re: Miles per Gallon

Had my diesel since the beginning of January and have been averaging approx 26 MPG in mixed driving but recently drove from Dallas to South Parde Island and back (550 miles each way) at fairly high speed all the way (85 - 90 on toll road near Austin). I am delighted with the results, approx 29 mpg going south and 30.8 coming north. Compare to my 2014 hemi JGC on the same trip at 19 going south and 21 coming back!!! U think this is amazing for this truck. Not as good as my wifes Jetta though (44MPG)
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  #115  
Old 02-28-2014, 03:33 PM
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Re: Miles per Gallon

So far 6 fill ups and half are just around 26 MPG and half are above 28 MPG. My last fill up was over 28 and I had more city driving than usual although not really a big percentage of miles. The real difference is the temp. This tank is being consumed during crazy cold temps again and while I have gotten the avg reading up close to 28 the reading on the trip odometer is down by 26 and these last few days it has gotten even colder so I anticipate that the next fill is going to be a 26.

I did notice that the instantaneous reading is less when it is cold and when you cost into a stop it often goes up which I assume means it is pumping fuel to warm up the engine. Today it was -5 and I probably drove for 20 minutes before the oil temp was up in the normal range and if you let off for a while it dropped down pretty often.

It is really rare to see this many single digit and negative days so I think that in a week or two I will be consistently in the 28's and cannot wait to see what I get when we go back to summer fuel.

I was running late this morning so I really was cruising up the road so maybe my numbers will be even worse than anticipated but I think that when it is really cold that you really do not gain by taking it easy so maybe not.

When I bought it I was hoping to average 28 as all my other diesels usually stayed around the posted highway miles. I think once the summer comes I will be above that easily. Also cranking the speed up today was so easy even though my ride is very hilly and on the way to work more uphill than down.
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