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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 January 3rd, 2012, 15:35   #1
Alaskan Driver
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Default Euro rental TDI wagon much better mileage, why??

We rented a TDI wagon in Germany and after converting the mileage we were getting almost 60 mpg on the autobahn with some village driving added in.
On one long trip I think it was over 62mpg.
Meanwhile back here the 2011 Jetta sportwagen gets 42 to 45 on the hwy....

What gives??
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Old January 3rd, 2012, 15:38   #2
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Better gearing!
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Old January 3rd, 2012, 15:55   #3
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Wow, even though both were manual trans?
I thought it might have been some sort smog control import junk...
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Old January 3rd, 2012, 16:19   #4
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How were you measuring the MPG? If you were using the MFD's MPG display, it may have been displaying miles per imperial (UK) gallon. The UK gallon is about 20% more than the US gallon, so the MPG will go up accordingly.
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Old January 3rd, 2012, 16:21   #5
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I wonder about the quality of the fuel.
My milage went down a bit around 2004 or so. (in the US)
I wish they posted the cetane value lick they have to post the octane of gas.
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Old January 3rd, 2012, 16:37   #6
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Quote:
How were you measuring the MPG?
Pencil, paper, conversion from liters to US gallons.
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Old January 3rd, 2012, 16:44   #7
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Great question. I had a V-12 BMW in Germany that I could pull down 28 MPG with...
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Old January 3rd, 2012, 21:34   #8
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Quote:
Originally Posted by Alaskan Driver View Post
We rented a TDI wagon in Germany and after converting the mileage we were getting almost 60 mpg on the autobahn with some village driving added in.
On one long trip I think it was over 62mpg.
Meanwhile back here the 2011 Jetta sportwagen gets 42 to 45 on the hwy....

What gives??
Big part of this is the cetane value of the diesel in Europe as a whole. Here in the US it is about 40/42 in the UK for example BP Ultimate diesel is with cetane value of 55 and this make a HUGE difference. In Europe the minimum cetane level by law is 50 or the gas company cannot sell it. Yes by law.....in the US the minimum number needs to be 40 so almost everyone producing diesel stay with the minimum requirements and making more money
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Old January 6th, 2012, 12:43   #9
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Quote:
Originally Posted by Alaskan Driver View Post
We rented a TDI wagon in Germany and after converting the mileage we were getting almost 60 mpg on the autobahn with some village driving added in.
On one long trip I think it was over 62mpg.
Meanwhile back here the 2011 Jetta sportwagen gets 42 to 45 on the hwy....

What gives??
Absense of MPG-robbing emission controls on the Euro Wagen rental?
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Old January 6th, 2012, 13:15   #10
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Higher tolerance of NOx means less fuel consumption, as the engine can run "leaner". Thank your EPA for this. (but you can buy a perfectly legal 5.7L V8 here...as many as you want).
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Old January 6th, 2012, 13:22   #11
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Quote:
Originally Posted by Alaskan Driver View Post
We rented a TDI wagon in Germany and after converting the mileage we were getting almost 60 mpg on the autobahn with some village driving added in.
On one long trip I think it was over 62mpg.
Meanwhile back here the 2011 Jetta sportwagen gets 42 to 45 on the hwy....

What gives??
Better fuel, less emissions bull****, and less weight due to different equipment! Fuel efficiency is not in Big Oil's best interest.
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Old January 12th, 2012, 07:56   #12
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Default 2.0?

No offense but might the car have had a 1.6l instead of the 2.0? I have a 2010 1.6 TDI that we regularly drive 5-6 hours a stretch on the autobahn.

My best tank was 4.9l/100km (49mpg) going to switzerland and back. This winter so far it's averaging around 5.8 (~40mpg). Speeds are much higher here so I imagine if this engine was in the states you'd regularly see high 50s.
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Old January 12th, 2012, 08:00   #13
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Quote:
Originally Posted by 3waygeek View Post
it may have been displaying miles per imperial (UK) gallon. The UK gallon is about 20% more than the US gallon, so the MPG will go up accordingly.
+1.

Your perceived 60 mpg is ~50 mpg. Probably less if you were to perform a manual calculation.
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Old January 12th, 2012, 08:53   #14
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Quote:
Originally Posted by dieseldorf View Post
+1.

Your perceived 60 mpg is ~50 mpg. Probably less if you were to perform a manual calculation.
The OP did say
Quote:
... after converting the mileage ...
and also
Quote:
Originally Posted by Alaskan Driver View Post
Pencil, paper, conversion from liters to US gallons.
which implies that he was already doing a manual calculation (probably from litres/km since that is what the computer will normally display on a car hired from Germany.
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Old January 12th, 2012, 09:03   #15
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Quote:
Originally Posted by MikeMars View Post
The OP did say and also which implies that he was already doing a manual calculation (probably from litres/km since that is what the computer will normally display on a car hired from Germany.
If so, I'd luv to see the math and how many times he achieved in excess of 60USmpg.
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