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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 May 14th, 2019, 07:34   #31
tikal
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Join Date: Apr 2001
Location: Southeast Texas
Fuel Economy: 37 MPG (~ 45% city)
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Quote:
Originally Posted by sloinker View Post
I can get over 60mpg in the summer going to work. I'ts a chore and 55-60 mph tends to anger folks on the 80mph freeway. The 51psi tires are a little harsh and the speed to merge is counted in minutes. If I run my aircon, drive normally at the 80mph limit, merge quickly, run my tires at 40psi I will get consistent mid 40's in the summer depending on wind and temperature. In the winter with cold temps, winterized diesel and snow tires I can consistently get upper 30's to low 40's. This is actually true for both my hatchback and sportwagen, both dsg's. My unfixed manual 2015 Passat managed a couple miles more per gallon but she is history with the buyback.
Good summary! I would venture to say this assessment is spot on for the majority of CR TDIs on the North American roads.
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Old May 19th, 2019, 18:40   #32
Webbie1
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Location: Rockford, IL
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After driving how I normally drove for a day, and getting a piddly 39 mpg actual mileage, I went back to trying to drive for mileage. It turns my 50 minute drive into an hour drive, but it's worth it. With 470 miles on this tank, I show an indicated 57mpg average. I know actual mileage will be less, but still over 50 mpg. On top of that, I checked my tire pressure today and found they were all inflated to 35 psi. I filled them to 45 psi to see how much that improves mileage (51 psi is max on the stock Hankook tires). I'll get some idea tomorrow. I only drive 3 times this week, as it's my carpooling friend's turn to drive on Tuesday and Thursday, and I think I'll take the motorcycle on Wednesday, so I'll have about 700 miles on this tank when I fill it. Hopefully 14 gallons or less.

Warner
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Old Yesterday, 07:09   #33
scooperhsd
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It depends on your motorcycle `- my TDI's do better MPG than my bike (1998 Honda Valkyrie)
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Old Yesterday, 09:15   #34
Webbie1
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Originally Posted by scooperhsd View Post
It depends on your motorcycle `- my TDI's do better MPG than my bike (1998 Honda Valkyrie)
Oh completely. My TDI does better than the bike too. I'll get about 40mpg on the bike......but it won't be at 65-70 mph.

Warner
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Old Today, 12:26   #35
andreigbs
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Quote:
... I filled them to 45 psi ...
Yikes, that's a bit much no? I know the tires may be able to take it just fine, but even at my current 35psi it feels a little harsh.

You're also likely to chew up the insides of the tires being overinflated. Saving money on fuel to spend on tires still ends up costing you.

To each his own I guess.
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2014 Golf TDI // 45xxx miles // 38 MPG - buyback'ed
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Old Today, 12:28   #36
Webbie1
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Originally Posted by andreigbs View Post
Yikes, that's a bit much no? I know the tires may be able to take it just fine, but even at my current 35psi it feels a little harsh.

You're also likely to chew up the insides of the tires being overinflated. Saving money on fuel to spend on tires still ends up costing you.

To each his own I guess.
If max inflation is 51 psi, then 45 psi is not "overinflated". It doesn't feel the least bit harsh.

Warner
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