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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 July 31st, 2019, 19:24   #286
jhonster
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Location: Los Angeles, Ca.
Fuel Economy: 42-50 mpg
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Quote:
Originally Posted by Mike14VW View Post
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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Thatís just an incorrect statement. The maximizing of the A/F ratio is done by the oxygen sensor & the feedback controls. Stoichiometric fuel mixes come from the emissions system toggling rich/lean to achieve stoichiometricity & thus maximizing the air/fuel ratio. A plugged or restricted fuel filter will usually affect power, but you can still have a maximized air fuel ratio.
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Old July 31st, 2019, 19:40   #287
jhonster
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Originally Posted by oilhammer View Post
LOL, you guys kill me. Seriously, if any 4 cyl TDI was getting 29 MPG you'd have a constant black cloud following you around. There simply isn't any way the engine could consume that much fuel. Or you have a fuel leak.
So. Iíve been meaning to post this for a while now.
Bought a 2013 Jetta sportwagen TDI in Feb of this year. Had a 2010 before this one that always got high 30ís (38mpg) on average. This one on the other hand has been getting 22-25mpg since I bought it. It had 93k when I bought it. Supposedly had the emissions update done (sticker under the hood). And the hi pressure pump just failed which was covered by VW about a month ago. So, with 98k on the car, and the timing belt 30k away, I had the dealer also replace the timing belt, tensioners, water pump, etc. I was hoping after all that work, that the mileage would pickup back to what my 2010 used to get. I drive mostly freeway & steady state 75-90mph. The car runs great & has plenty of power. Although the check eng light just came on & has stayed on. Code P2002 (8194 fac VW code) particulate trap bank 1 efficiency below threshold. The light 1st came on last Friday & it hasn't gone off. It's failed the testing parameter 4 times now. Any common failures that cause this issue where MPG is around 22?
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Old July 31st, 2019, 23:27   #288
Lightflyer1
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I read another post saying clogged dpf's can cause this. Either not regenerating properly or clogged or something else broken causing this to occur.
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Old August 2nd, 2019, 16:16   #289
jhonster
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Originally Posted by Lightflyer1 View Post
I read another post saying clogged dpf's can cause this. Either not regenerating properly or clogged or something else broken causing this to occur.
But the mileage issue has been constant since I bought it in Feb. The check eng light issue with the DPF is just within the last week. Iíve been tracking the mileage since I bought the car 5 months ago.
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Old August 28th, 2019, 11:33   #290
jhonster
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Quote:
Originally Posted by oilhammer View Post
LOL, you guys kill me. Seriously, if any 4 cyl TDI was getting 29 MPG you'd have a constant black cloud following you around. There simply isn't any way the engine could consume that much fuel. Or you have a fuel leak.
Well. Iíve got a 2013 Jetta Sportwagen TDI that is currently getting 23 to the gallon. Yup. Itís been that way since I bought it in Feb of 2019. Iíve checked every tankful for months & thousands of miles. Itís crap.

I had the high pressure Fuel pump just crap out & the dealer replaced it at no charge. Had them do the TB, tensioner & water pump at the same time. The emissions update was done before I bought the car (sticker is there under the hood). The Ck eng light just recently popped on & the car has both a catalyst low efficiency code & an EGR code as well. Iím just going to take it back to the dealer & tell them to fix the check eng light & complain about the terrible mileage.
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Old August 28th, 2019, 12:08   #291
_Colty_
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Was getting 40-44mpg. Got a CEL for DPF efficiency blah blah. Warranty magic and 50-55mpg. Mine is a 2 door manual and I engine brake like a crazy person and draft a reasonable amount, but it made a big difference. VW will likely warranty it if you even have a "pending fault" which a cheap $12 amazon OBD2 to Bluetooth scanner (with Torque pro) will be able to tell you about.
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Old December 30th, 2019, 19:17   #292
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1st I keep trying to search but the search box disappears, anyway. Has anyone used the Malone tune and noticed a gain in fuel economy (I was looking at the stage 2 and dsg tune)
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Old December 31st, 2019, 19:07   #293
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The tunes are for performance mostly not economy. Some do report economy gains though (when not using the power) but not enough to offset the cost of the tunes. $1k buys a lot of fuel! Not to mention loss of warranty if you have any left. The best thing for increased fuel economy is changing the way you drive. That in a nut shell makes the most difference than anything you can do, and it is free.
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Old January 1st, 2020, 17:10   #294
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I average 30mpg highway only, not taking off like I'm drag racing. The speed limit is 70mpg to work for 30miles so I'm at 70-57mph at 2200-2400rpms. Im just confused because my wife has a 2019 Toyota Corolla that averages 27 highway/city. Uggg lol
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Old January 2nd, 2020, 07:24   #295
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Not trying to be rude but either there is something that needs attention with your car or you need way better driving skills. I wouldn't exactly say a 30 mile drive at speeds varying between 55 to 70 mph lend themselves to really call your driving "all highway". Is your car an auto or manual? How you drive in that 30 miles is going to make a huge difference. You can't be speeding up and slowing down all the time. I would read up on eco driving and find someone with VCDS near you to scan the car and check things out for you. Even a dragging brake could account for your bad economy. It needs some investigation of your car and your driving to improve anything. Not something we have enough info to really help with at the moment. If you have a car issue or bad eco driving skills a tune won't help and may hurt even more. The first rule of tuning is to make sure your car is in tip top shape before doing anything.
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Old January 2nd, 2020, 12:19   #296
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No I don't take it as rude, I should have previewed my post, the speed limit is 70. So I set the cruise at 75, it is automatic. The only other speed change is when I get into the office ramp for the last few miles it's 55mph the rest of the way to work. But your right I will have someone look at. Because I don't have the diagnostic tools. I have had 2 others agree that something has to be wrong or maybe the new software that VW used to pass emissions could hurt also. Thanks for the help
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Old January 2nd, 2020, 14:12   #297
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Read up on eco driving as well. Cruise control isn't exactly the best choice necessarily. Slow down. Do 65 in the right lane and let the other traffic go by you. In 30 miles it will only add minutes to your drive and the fuel economy will go up. Wind resistance above 60 mph makes a huge difference as speed increases beyond that. Dropping from 75 to 65 should show a decent increase in economy.
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Old January 10th, 2020, 19:30   #298
asgoodasdead
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i do cruise control anywhere from 72-78 commuting to work and i still average around 40mpg.


i only fill up with shell, exxon diesel efficient, or bp/amoco and always keep my tires at 35psi.


manual trans
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Old February 10th, 2020, 11:07   #299
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When we can get these things in diesel electric it would be nice to see the fuel economy at least double what we are getting now.
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Old February 11th, 2020, 12:16   #300
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When we can get these things in diesel electric it would be nice to see the fuel economy at least double what we are getting now.
I don't think a diesel-hybrid will ever make it to the states, at least.
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