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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 Yesterday, 01:41   #16
y2kbird
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Fuel Economy: 45-50mpg
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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 right before departing, and after I got home.

Result: 52.27mpg: 559.3 miles, 10.7 gallons used. average speed of 65mph, limited AC. MFD indicated 59mpg average

gauge:
7/8 at 199 miles driven
6/8 at 275 miles driven
5/8 at 373 miles driven
4/8 at 463 miles driven thru refuel point of 559.3 miles

assuming a 15.5 gallon tank, the remaining 4.8gallons would have yielded me only 250 miles at the same mpg, despite the gauge still being on half. So much for a linear fuel gauge.

If VW has it set to indicate Empty with 2gallons left, using 2.8 more gallons / 146 miles would have cleared the second half of the gauge.

Last edited by y2kbird; Yesterday at 01:45.
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Old Yesterday, 08:25   #17
2015vwgolfdiesel
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Fuel Economy: City mid 40s ~ Road mid 50s
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Quote:
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 right before departing, and after I got home.

Result: 52.27mpg: 559.3 miles, 10.7 gallons used. average speed of 65mph, limited AC. MFD indicated 59mpg average

...snip...
Thanks for your info
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Old Yesterday, 08:49   #18
ezshift5
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[QUOTE=y2kbird;5284269]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 right before departing, and after I got home.

Result: 52.27mpg: 559.3 miles, 10.7 gallons used. average speed of 65mph, limited AC. MFD indicated 59mpg average
[/QUOTE.

You are off to an impressive start 'bird...............

..............I say this knowing you've got a 'green' (as in not fully broken-in TDI!!

Can't beat the TDI/6M drive train for fuel numbers......(and it will just get better).

all the best hombre




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Old Yesterday, 09:58   #19
2015vwgolfdiesel
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y2kbird

Quote:
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 right before departing, and after I got home.
35 years ago I stopped topping off my 1978 Chevy 3/4 ton van. Not sure, but think it had about a 28(?) gallon tank, and only got 12-ish MPG.

I hyper filled it one time, and had approx 3+ more gallons in after the first automatic pump cut off.

...then it dumped a load of gasoline on cement, 3 foot wide, 8-9 long.

...sure it was more than 1 gallon.

... loss of $$$$s was a concern--- real fear of fire was the quintessential issue; especially if you fill then go straight to your home garage. We had a gas water heater with pilot light in garage area

... thoughts anyone?
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Old Yesterday, 13:02   #20
ezshift5
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Thoughts? Here's one.........


....hopefully your gas water heater garage installation reflected - even in earlier times - the 18" above grade code requirement..................



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Old Yesterday, 14:32   #21
2015vwgolfdiesel
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Originally Posted by ezshift5 View Post
Thoughts? Here's one.........


....hopefully your gas water heater garage installation reflected - even in earlier times - the 18" above grade code requirement..................



ez
Thanks

We are up to code, I'm sure as we have replaced the water tank twice, in the last 43 years, living here, by licensed contractors.

By my own volition, I might cram fill my TDi when going on a trip. Trying to judge the amount to over fill it. But filling to go straight to the garage, I will go to the first pump automatic cut off point, then one more single squirt.

Close enough for government work
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Old Yesterday, 20:41   #22
y2kbird
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Does anyone have a guess of what my mileage would have been in a DSG? Reason I ask is I am looking at a 2nd 2015 for my wife. DSG is more prevalent plus she hasn't mastered driving a manual yet. As far as my taking a risk by filling to the brim--old habit from the Tdiclub monthly mileage spreadsheets. Diesel does not have the flash point as unleaded vapors. A big spill in the garage would be a nuisance more than a fire hazard. I have tested these clear fuel in filler neck fills a block from home and parked it. never had any leak or spray out when I unscrew the cap the next morning. Since the tank is plastic, I suppose if there was a huge rise in outside air temperature between filling it up and storing the car there would be some expansion or higher pressure. If VW can only allow for a 95% fill though, maybe they account for it somehow other than the tiny amount the fuel filler neck holds.
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Old Today, 04:47   #23
Blue_Hen_TDI
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Originally Posted by y2kbird View Post
Does anyone have a guess of what my mileage would have been in a DSG?
My DSG is doing slightly better than your 6M, but that is likely due to different driving style. I typically drive 60-65 mph (5-10 over posted limit).
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