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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 April 1st, 2003, 11:09   #16
jettajim
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Join Date: May 2000
Location: near Houston
Fuel Economy: 6spd=46 lifetime, '12 Passat gasser-terrible
Default 1400 miles (2254 km.) on 1 tank!!

That's damn good but.....so far, I have 56k miles on 1 tank
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Old April 7th, 2003, 20:31   #17
MORE_MPG
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Join Date: Sep 2001
Location: Northeastern Berks County, PA, USA
Fuel Economy: 55/43/38
Default 1400 miles (2254 km.) on 1 tank!!

Hi Chris,
- At times like this I have to admit that my plate is in comparison to other cars, not some TDI's.
- I have almost gotten to 1200, but have lost patience.
- If you get those larger diameter tires you will have to switch to a "odometer" that doesn't use the tires like a GPS. You will acutally go farther, but the car's odometer won't tell you that.
- Are your sedan's 15" wheels alloy or steel?
- Nice job on the MPT!
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Old April 10th, 2003, 12:56   #18
Chris Bell
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Join Date: Feb 2000
Location: Santa Barbara, CA
Default 1400 miles (2254 km.) on 1 tank!!

Ben, I tried the larger tires (on aluminum wheels) and didn't like the result and went back to stock 14" wheels/tires. There actually wasn't a problem with inaccurate odometer/speedometer because I installed a little device that modifies the distance signal to the instrument cluster and renders the speedo/odo accurate regardless of tire size.
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Old April 10th, 2003, 18:46   #19
itsmejerry
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Default 1400 miles (2254 km.) on 1 tank!!

Quote:
because I installed a little device that modifies the distance signal to the instrument cluster and renders the speedo/odo accurate regardless of tire size.

WHAT IS IT!!!!!!??????????
um.. sorry.. ah-- an little device to the instrument cluster, hmm... you don't say... So, what kind of instrument is it?
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Old April 11th, 2003, 07:55   #20
SwimmerDave
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Join Date: Sep 2002
Location: Decatur, GA
TDI(s): 2014 JSW 6MT
Fuel Economy: 45
Default 1400 miles (2254 km.) on 1 tank!!

Congrats !! This is truly impressive. 1400 miles is Chicago-Atlanta round-trip !!
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Old April 11th, 2003, 14:30   #21
Chris Bell
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Join Date: Feb 2000
Location: Santa Barbara, CA
Default 1400 miles (2254 km.) on 1 tank!!

Quote:
an little device to the instrument cluster, hmm... you don't say... So, what kind of instrument is it?
Its an adjustable pulse frequency adaptor that modifies the VSS (Vehicle Speed Sensor) signal which drives the speedo/odo.
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Old April 11th, 2003, 19:26   #22
truav8r
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Join Date: Mar 2003
Location: Albany, NY
Default 1400 miles (2254 km.) on 1 tank!!

Quote:

Its an adjustable pulse frequency adaptor that modifies the VSS (Vehicle Speed Sensor) signal which drives the speedo/odo.
ok, I'll bite... and where does one get an adjustable pulse frequency adapter?? Does not sound like something on the shelf at Wallyworld, or at the stealership for that matter.
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Old April 12th, 2003, 08:56   #23
Chris Bell
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Join Date: Feb 2000
Location: Santa Barbara, CA
Default 1400 miles (2254 km.) on 1 tank!!

Here is the pulse frequency adaptor.
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Old June 13th, 2003, 13:27   #24
Rico567
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Join Date: Jun 2003
Location: Central IL
Default Re: 1400 miles (2254 km.) on 1 tank!!

"..speed really makes a difference in mileage on this car. "

Speed makes a difference in mileage with every car; at least it has with every car we've ever owned. This difference is easily observed by tracking the mileage patterns of my wife and I. Our current "family car" is a 2001 SAAB 9-5 wagon. If I'm driving, it's usually about 10 over, 75 mph, and it's getting 27-28. If she's driving it's about or a bit under the limit, and it'll get 33-34. One time I was driving back from Ohio and was in heavy rain most of the way, and had to slow down- sure enough, my mileage jumped up to the high figure. It's been like that with most of the cars we've owned, possibly not as dramatic a difference, but there.
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Old July 23rd, 2003, 22:44   #25
spifflifkin
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Join Date: May 2003
Location: ***
TDI(s): none
Default Re: 1400 miles (2254 km.) on 1 tank!!

Quote:
that when you fill up using the "vent trick",
How's that work?

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Old July 24th, 2003, 16:27   #26
MITBeta
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Join Date: Feb 2001
Location: Boston's Metro South-West
Default Re: 1400 miles (2254 km.) on 1 tank!!

Quote:
How's that work?
Just about as well as the search function
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Old July 24th, 2003, 18:31   #27
spifflifkin
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Join Date: May 2003
Location: ***
TDI(s): none
Default Re: 1400 miles (2254 km.) on 1 tank!!

Thanks MITBeta! I appreciate you taking the time to help out.
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Old July 24th, 2003, 18:55   #28
MITBeta
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Join Date: Feb 2001
Location: Boston's Metro South-West
Default Re: 1400 miles (2254 km.) on 1 tank!!

My pleasure! You know what they say, give a man a fish, feed him for a day, teach a man to fish, feed him for a lifetime...
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Old July 30th, 2003, 08:22   #29
Denver_Diesel
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Join Date: Apr 2003
Location: Colorado
Default Re: 1400 miles (2254 km.) on 1 tank!!

I'm skeptical. If you figure a vented tank is 16 gallons, that comes out to 87.5 miles per gallon. It is not an impossible figure I guess, but you would have to be driving the with a nice tailwind the whole way, probably downhill the whole way, and with the best summer diesel fuel out there. I just finished a long road trip and I was driving pretty conservatively, and had favorable to average weather. My best leg was 54 mpg. I suspect that your universal speedometer signal interface is not calibrated correctly. After all, as far as I can tell, this gadget takes in a pulse rate (the "speed signal") and spits out a different one that allows you to recalibrate for tire size or gearing changes. .....

correction...

just noticed it is a passat wagon with a BIG gas tank. I was thinking it was a jetta tdi. making more sense now....good job!
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Old February 5th, 2004, 09:46   #30
Buchu
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Join Date: Feb 2004
Default 1400 miles (2254 km.) on 1 tank!!

[ QUOTE ]
Impossible? <P>1407 miles (2265 km.)<BR>24.19 gal. (91.57 l.)<BR>58.2 MPG<P>I took a 1000 mile business trip and thought I would try to better my previous records for mileage and cruise distance (49.5 MPG, 1206 miles). I upped tire pressure to 44 PSI, chose a route that I thought would be the flattest (turns out it wasn't the best choice), and slowed down a bit. The results, according to my MFA, were so encouraging that it made a perfect excuse to take another 300 mile trip (thinking that would be as far as the car could go...wrong!).<P>Since I had a useable 1/2 gallon left at the end, I think that once I install my Upsolute chip and larger diameter tires, and choose a flatter route, I should be able to go 1500 miles (though I'm in no hurry to do this any time soon).<P>The Passat wagons can't compete with the 5-speed A4s (nor some of the Passat sedans on the Forum) in terms of real world MPG, but their big tanks have certain advantages. I think I have really earned my "Fahrfrumpumpen" sticker!<p>[ July 29, 2001: Message edited by: Chris Bell ]

[/ QUOTE ]

Bah... with my Fiat Stilo 1.9 JTD 115HP and not only by regular highway, I do: 1200km (50 lt of Diesel Fuel)!!!

And now, with new MJTD 1.9 140cv I think is more difficult for TDI!!

TDI is more noise than JTD, and just a little expensive.

Hi all
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