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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 September 30th, 2017, 10:03   #31
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No Phase 1 "fix": I filled up my tank and left home at 10:00 AM yesterday and did about 8 hours of driving (round trip) together with 8 shutdowns/startups at rest stops and historical sites. I did five 3 minute idle cool downs before 5 of the shutdowns after working the turbo hard. I drove probably 1 hour on very hilly and washed dirt roads, some places were only passable in 1st gear. During that time, I didn't get above 15 MPH. The rest of the time was split between gravel and paved roads driving between 20 and 65 MPH. I traversed a total of 343 miles and used approximately 6 gal. of diesel. The estimated range left was 345 miles. Calculated, that's approximately 57.2 MPG for my trip yesterday.

This is the typical performance that I see for my vehicle. General driving style: high gear, low RPM.

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Last edited by Miss_Athanatos; September 30th, 2017 at 10:06.
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Old October 5th, 2017, 07:51   #32
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Join Date: Apr 2005
Location: West Hill, Ont. Mexico mid October 2017 to end of April 2018

The only way to get accurate Mpg is to fill the tank up to the top each and every time. Keep track of the mileage when filled and amount of fuel put in and do that over many fill-ups, i.e 1 or 2 years. That is the ONLY way to get a true average Mpg. Any electronics readout such as MFD lie to you!!!!!
All interior bulbs to LED. Several VCDS modifications. Darker window tint. EVO skid-plate. Malone Stage 2, Winpower Projector headlights. Angel eyes.LED DRL's.Average 1 year 30/6/16 to 30/6/17 - 50.71 Mpg - 5.56 L/h

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Old October 5th, 2017, 10:06   #33
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Join Date: Aug 2004
Location: South of Boston
Fuel Economy: 50/45/37

Actually if you record over a large number of tanks it doesn't matter if you fill it completely or not. If you're looking for a one or two tank average it does.
2002 Jetta wagon, 358K, RC3+; 1993 Mercedes-Benz 300D 2.5, 197K; 1997 Passat, 285K; '99.5 Golf, 255K; 2011 335d, 55K; 2015 Golf Sportwagen, 5K. Principal, http://www.idparts.com
Kid's cars: 2002 Golf TDI, 2002 Jetta TDI
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Old October 10th, 2017, 10:59   #34
Chris Bell
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Location: Santa Barbara, CA

Originally Posted by Jetta_Pilot View Post
Any electronics readout such as MFD lie to you!!!!!
Originally Posted by IndigoBlueWagon View Post
Although the FE on these cars is very good, take those readings with a big grain of salt. The cluster in my car reads at least 4 MPG high. Others have reported similar errors.
Originally Posted by Growler View Post
I have been driving my DSG Sportwagen In Central Ohio from Buckeye Lake to Gahanna daily and since april ove rthe last 11k miles I have averaged 43.6 mpg according to Fuelly, my MFA reads consistently 4-5mpg high since fillup and I assume since start.
You all know that MFA calibration is a simple VCDS adaption, right?

Instruments (17)/Adaption/00499

A value of 108% (100 is default) seems to work well for some. My recorded deviation from all tanks is about that, so I used it but just made the change and so cannot comment yet on accuracy.

I should qualify that this is true at least for MkVII Golfs.
'15 GSW SE 6MT, '01 Golf 5MT
'97 Passat sedan, '96 Passat variant
'99 BMW M3 Cabrio

Last edited by Chris Bell; October 10th, 2017 at 13:02.
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Old October 12th, 2017, 23:04   #35
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Location: Virginia

Originally Posted by Jetta_Pilot View Post
My readings are averaged over city and highway driving.

In my opinion there are a lot of dreamers around here.
In my 2012, the lifetime average was 48.3mpg under all conditions over 188K. So I was regularly running in the +50mpg range.

My newer 2015 is currently running an average of about 51.2 mpg with about 5K on the clock.

Further I have proven that with luck and ideal conditions mpg above 60mpg can be maintained in a Mk6.

Only known Mk6 in the 1,000 mile club.

While the car has the capability, the governing factor is still primarily your right foot and how well you can control it.

That said, a DSG is going to cost you about 2 mpg.
2012 - No mods. First Mk6 in 800 mile club & 1000 mile club (Totaled and retired)
2015 - No Mods.
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Old October 25th, 2017, 17:23   #36
Join Date: May 2014
Location: Indiana
Fuel Economy: 42-43 mpg

2013 Jetta TDI, mileage runs between 40 and 45. I have yet to get over that. I'd like to know what effect the new government emission mods have had on TDIs. I do experience improved mileage when I dump a can of Sea Foam or GumOut fuel treatment into the tank. Summer AC driving on interstate at 75 nets me about 41. If anyone knows about those computer chips in TDIs which are supposed to improve mileage and performance, I'd like to hear about it. Good Luck, Cowboy CVW
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