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Premium Member
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Discussion Starter #1
Hello everyone. I am new to the site and new to Diesels. Purchased my 2014 Jetta Sportwagen TDI about eight months ago. Although I expected to see better gas mileage (trip to Grand Canyon) I still love this vehicle. I look forward to participating on the site and maybe corresponding with some of you. I am a retired Naval Officer with plenty of time for travel in my TDI and also plenty of time to tinker with it. Great to be here!
 

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Premium Member
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177 Posts
Welcome. I suspect your TDI has the post dieselgate software "fix" on it which robs horsepower and mileage. Most likely that is why you are not seeing the fuel economy you expected.
 

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Discussion Starter #3
You are correct. I would be interested to know if there is some way to regain the old gas mileage.
 

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Discussion Starter #5
How much of an increase did you actually get? The site says 10%, which in my case would be about 3.5 miles. Also, how difficult was it to do the mod? Thanks for our time.
 

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177 Posts
I got 4-5%. How you drive also makes a huge difference. For example I drove to AZ from WA last spring and the way down I stayed on interstates that were 80mph and saw the 4-5%. On the way back I did a lot of sight seeing on 55mph back roads and it was more like a 15% increase. I also added the DSG tune to mine shortly after because I hated the hesitation the car had starting out often.
 

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Discussion Starter #7
Well, my son lives in Lynnwood, WA and I may be taking a trip up there. I will monitor my mileage a little better then decide whether it is worth it for me. How about the tune? Did you do it yourself? Was it difficult?
 

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177 Posts
Oops sorry about that. Installation is super easy. They send you a little handheld unit and cord that connects it to your OBD2 port along with instructions. It takes about 5 minutes to download the current program from your ECU, then you email it back to them. Depending on when you send it to them you will get your new program the same day and it takes about 10 minutes to load the new program onto the ECU. It's all very easy, simple to follow instructions and the nice thing is you store your old tune on the unit so if you ever want to sell the car in a state where the modification isn't allowed you can just put the factory tune back on it.

Now I will tell you when I loaded the new tune I had an antiskid/traction control light come on but after I drove the car 30 feet or so it went away and I've had no problems since (2+ years). I don't know if your car is an automatic or manual but the reason I also got the transmission tune is because the new engine tune gives you so much more power and torque that I was constantly spinning tires when I didn't want to. I am not an aggressive driver at all but the DSG on these has a tendancy to hesitate when you first start out from a stop, and if you push the pedal down more to get it going, when it does kick in it just spins the tires like mad. The new engine tune made that issue worse and the transmission tune got rid of it.

I think you will like the tune. It makes a night and day difference in power so the car works less hard and gets better MPG as a result.
 

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Super Moderator
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9,227 Posts
Welcome to the forum.


Its nice to see you made an intro on your own. ;)

This forum has been down for 2 days.

This is a new forum layout with loads of bugs which have been reported in the new thread. There is no TDI Wiki at the moment or original similes. It doesn't show the car spec/location.

We Are Live - Community Feedback

This has been talked about many times.

I've made a poll which no one has posted in, there are a few votes and comments.

Do you like the new forum features?

Wiki pages have been restored as of 7th December, I asked where is the link it should be on top of the main forum.
 

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No I have not! What is it? Sounds interesting to ths retired Aviator.
Have you ever noticed how much diesel fuel foams? Well there is a guy in Houston that sells an anti-aeration anti-foam
fuel additive. When I spoke with him I had never heard anybody talk like he talked about fuel. So I thought heck I would try out his product. I figured heck it cannot hurt. He said it was not an additive. It added nothing to the fuel. So I bought a bottle, Drove my car from Vegas to Baker, ca (death valley) about 80 miles. My trip computer said I got 43.7 miles per gallon. So when I got to Baker I added about half the bottle and filled the car back up about 2 gallons of fuel. I got back out on Interstate 15 and headed back to Vegas. My engine seemed to be noticeably quieter within 5 minutes. when I got to Vegas I was getting 47.3 miles per gallon. I called the guy and bought 5 more bottles. I am down to 2 bottles as I only add it every other tank. But Holy shit in my 65 years on the planet I have never seen an additive work like this. Let me know I will send you his phone number. He is a Texan
 
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