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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 17th, 2019, 15:46   #271
Lightflyer1
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On used cars I buy from people i do the same. For this car from the dealer though, I had them do everything as part of the sale. No sense not to.
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Old June 17th, 2019, 16:51   #272
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What tire pressure do you guys run? Pumped mine up to 39, feels to roll more free than at 34 but it could just be placebo
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Old June 17th, 2019, 16:52   #273
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What tire pressure do you guys run? Pumped mine up to 39, feels to roll more free than at 34 but it could just be placebo
Think I'm around 45.

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Old June 17th, 2019, 17:28   #274
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Whatever is printed on the door card. You are doing things to save tiny slivers when just improving your driving will save you a slice. These are the kinds of things you do when your driving improvements won't/can't yield any better results.
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Old June 17th, 2019, 22:03   #275
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Originally Posted by Lightflyer1 View Post
Whatever is printed on the door card. You are doing things to save tiny slivers when just improving your driving will save you a slice. These are the kinds of things you do when your driving improvements won't/can't yield any better results.
Very true, if not very obvious to some. I do like to keep an eye on tire pressures, though, for reasons other than just fuel economy.

My biggest hit to economy is the obligatory errand-type driving close to home, which is even worse since the fix. My highway numbers are down some since the fix, but my city mpg seems to have taken a big post-fix hit. Before, a 60/40 city/hwy split reflected more of the highway average. Now, 20-30% city driving results in more of a "combined" tank average.

In any case, I'm still seeing numbers above the sticker EPA estimates for city, hwy and combined, so I can't really complain.
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Old June 18th, 2019, 01:04   #276
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It is 30/34/39 for my Beetle. Fuelly has me at 35 mpg average with no long highway trips and a 35 mile one way 3 days a week. I have never made a long trip only commuting, so don't know what the highway would actually be. Still beating the EPA estimate by 1 mpg for combined economy. My 2003 Beetle was about 44 mpg average for the same driving as was my 2005 Beetle. My 2012 Passat was around 42 but did way better on the highway. Somewhat disappointed in the current Beetle but it is still way better than a gas car and is fun and easy to drive. Not many of the 2015 Beetles were sold is my understanding and the Beetle is discontinued this year.
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Old June 18th, 2019, 06:17   #277
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My 5houghts are the car sat and the filter may have taken on moisture with mold growing causing the filter pores to clog. Which in turn yielded the car to pull more fuel.

I think you have your thinking wrong! If something is plugged you have less flow !!!
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Old June 18th, 2019, 06:31   #278
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I think you have your thinking wrong! If something is plugged you have less flow !!!
Not sure what ur talking about. You can always give more throttle (fuel) to maintain the same speed of something less restricted.

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Old June 18th, 2019, 08:38   #279
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If the filter is clogged it will only flow so much fuel, no matter what throttle inputs you make. If it is so clogged that only an ounce of fuel can get through and you give it full throttle only an ounce will still get through because it is clogged. The more clogged it is the less that gets through, until none does.
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Old June 18th, 2019, 17:29   #280
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Whatever you guys wanna think, changing the clogged/dirty fuel filter will maximize air/fuel ratio and as result, gas mileage will increase.

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Old June 18th, 2019, 17:38   #281
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I would say a clean FF would contribute to better MPG but it’s not the reason I change my FF
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Old June 18th, 2019, 17:42   #282
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Your statement was:

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My 5houghts are the car sat and the filter may have taken on moisture with mold growing causing the filter pores to clog. Which in turn yielded the car to pull more fuel.
A clogged filter will not pull more fuel. That is the definition of clogged. Won't let anything through. If you are saying it passed more fuel when changed, well yeah a clean filter will do that.
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Old June 18th, 2019, 17:44   #283
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Good job!

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Old June 18th, 2019, 17:51   #284
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Well your statement was unclear and led to the conclusion you were saying a clogged filter passed more fuel. I don't know how you can't see that in the statement quoted that you posted.
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Old June 18th, 2019, 18:02   #285
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Well your statement was unclear and led to the conclusion you were saying a clogged filter passed more fuel. I don't know how you can't see that in the statement quoted that you posted.
Fair enough.

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