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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old June 20th, 2017, 05:59   #61
IndigoBlueWagon
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Fuel Economy: 50/45/37
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Just filled my GSW manual for the second time, 45.8 this tank. First tank was 40.7 but I'm not sure it was a complete fill, as the dealer filled it and I topped it off before I had a correct size fuel nozzle at my house. On the 45.8 tank the display said 48.3. Reads a bit high, I'd say. I don't particularly drive for economy, usually run at 75-80 on the highway, although for the last 100 miles on this tank was at 65-70, as I was leading a weak '01 Golf home that a co-worker purchased.
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Old June 20th, 2017, 10:08   #62
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Great number for doing 75-80!

I had my first sub-52 mpg tank last week when I road-tripped to Montreal for the F1 race. I wasn't very impressed with the numbers I was seeing on the Speedway brand diesel I filled with near Albany NY and then when I hit all the Montreal traffic, did short trips in the city for three days, and finally sat in a long backup to get back across the border checkpoint at I-87 I was doomed to low 50s. Boo. Glad to be back to my regular flat, rural commute now. Goal is to get the lifetime average over 55 mpg before cold weather comes this fall.
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Old June 22nd, 2017, 16:53   #63
giuseppe_b
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I am also in NM, the car is about to hit 3000 miles. On all tanks so far each calculation says 46 or so MPG, but the hand calculations for each tank are between 38 and 40 MPG. On a recent 1019 Mi road trip each way, I had a full car of stuff, luggage, and three other passengers. Plus it was very windy and that may have played a part.
Speed was varying as I'm still breaking it in, between 75 and 85 Mph, average was probably 80 overall. I filled up twice going to Texas and twice coming home. And the AC was on the whole time.

On another note: the car performed a regen every 250-300 miles. I thought that on a pure highway drive regens would occur less frequently, like every 500+ miles.
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Old June 22nd, 2017, 20:49   #64
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Just about done with the first tank on the '15 Jetta S 6M that I leased primarily to store for a rainy day or year post diesel availability. Low fuel light just came on, with 765 miles driven and 60 miles to empty showing. Will probably refuel at 800 miles versus pushing it to get to 850.. Will edit post with actual mpg soon
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Old June 23rd, 2017, 01:34   #65
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Fuel Economy: City mid 40s ~ Road mid 50s ~ Two (2) 61 MPG fill ups
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Quote:
Originally Posted by y2kbird View Post
Just about done with the first tank on the '15 Jetta S 6M that I leased primarily to store for a rainy day or year post diesel availability. Low fuel light just came on, with 765 miles driven and 60 miles to empty showing. Will probably refuel at 800 miles versus pushing it to get to 850.. Will edit post with actual mpg soon
WOW

Tank capacity in US Gallons?

Thx
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Old June 23rd, 2017, 05:04   #66
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14.5 gal tank on the Jetta
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Old June 23rd, 2017, 05:28   #67
2015vwgolfdiesel
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^^

Thanks
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Do the fix, pocket $8,000-ish 6, 776 miles on the clock, Pristine condition
BB = $25,625, but VW is not paying for PRIME condition nor ULTRA low miles.
Net bases in my 2015 Golf = $12,495
NADA-KBB for older CPO Golf TDi 2014 = $18,250
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Old June 23rd, 2017, 12:40   #68
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Quote:
Originally Posted by giuseppe_b View Post
On another note: the car performed a regen every 250-300 miles. I thought that on a pure highway drive regens would occur less frequently, like every 500+ miles.
When doing my daily commute I get a regen about every 150 miles. If on a road trip it's more like 200-350 miles between regens. No hard and fast rule here other then when the soot level reaches a certain point for a regen to be triggered - depends on the driving being done (city, highway, commute).
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Old June 23rd, 2017, 13:04   #69
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Mine regens every 250 mi and lasts ten minutes almost like clockwork (monitoring with Scangauge II). My driving is almost 100% highway. I cringe as I watch my mileage plummet for those ten minutes. Can't wait to do the DPF delete in 162k miles - lol.
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Old June 23rd, 2017, 13:40   #70
IndigoBlueWagon
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If you're deleting emissions hardware why are you waiting? For warranty replacement on parts you don't want in the car?
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Old June 23rd, 2017, 16:04   #71
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Quote:
Originally Posted by IndigoBlueWagon View Post
If you're deleting emissions hardware why are you waiting? For warranty replacement on parts you don't want in the car?
I want to see what happens with Phase 2 and how my DMV treats my car at inspection time.
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Old June 26th, 2017, 09:50   #72
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Quote:
Originally Posted by y2kbird View Post
Just about done with the first tank on the '15 Jetta S 6M that I leased primarily to store for a rainy day or year post diesel availability. Low fuel light just came on, with 765 miles driven and 60 miles to empty showing. Will probably refuel at 800 miles versus pushing it to get to 850.. Will edit post with actual mpg soon
Very curious to know what your range ended up being and what your calculated fuel economy was!
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Old June 26th, 2017, 11:41   #73
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Originally Posted by logdrum View Post
50.1 Hand Calculated from San Diego to Albuquerque 882 miles temps where in the 100 to 115 so AC was on, Speed Limit in these states is 75 but traffic flows at 80 to 85 and mountains high altitude 5K ft. Lie on meter said 51.4. Now over a week now in New Mexico going as high to Red River NM which is about 9K and Sandia Crest at 10,760 and the various Albuquerque and Santa Fe urban traffic and I am getting 46.2 combined. The car has yet to go over 2K miles. We have a hot spell in the state and AC is always on and usually 3+ persons in the car with some camping gear and a cooler. I really expected this thing to be below 40 mpg.
Wow. That's impressive and encouraging.
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Old June 27th, 2017, 15:35   #74
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We picked up our "new" 2015 GSW S DSG with 60 miles on the clock on May 15th in Albuquerque. We averaged 45.6 on our trip back to the Bay Area with our best tankful, 50.0 mpg between Indian Springs, Nevada and Truckee. Not bad for a fresh engine at altitude.

We're only getting 31 in our suburban driving and it'll probably drop a little more as I swapped out out the 16" rims with Ecopias on the new car for the 17s with the stickier Michelins from our 2010 JSW.
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Old July 6th, 2017, 23:38   #75
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Originally Posted by y2kbird View Post
Found a new 2015 Jetta SEL 6M Wed, and picked it up yesterday with <50 miles on it. Topped it off to clear fuel in the fill neck.
Result: 52.27mpg: 559.3 miles, 10.7 gallons used. average speed of 65mph, limited AC. MFD indicated 59mpg average
Same car, second tank: 15.69 (!) gallons to clear fuel in filler neck. 553 miles driven, for a calculated mpg of only 35.24. MFA indicated 39.7mpg.

This is 6mpg less than my 6sp MKIV's worst tank. 2/3rds city driving in NV with 115 degree outside temps and climatronic AC on half fan speed most of the time. The 1/3 highway driving was at 70mph with AC.

I put 15.84gal total into a '14.5gal tank'. Low fuel light came on at 1/8 indicated and 25 miles MFA distance to empty. MFA and gauge both hit zero 20 miles later. I drove it another 10 miles order to fill up 15.69gal at the exact same Sam's club pump as last time. Drove it once around the parking lot (no AC) then shopped to let it settle more. It then took .14gal more. So my usable capacity is at least 15.79gal for my 2015 jetta tdi sel.

Since I only drove it 30 miles after it hit 1/8 and the 1.9 gal 'reserve' fuel light, I may have still had a gallon more.

Last edited by y2kbird; July 6th, 2017 at 23:49.
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