deutschman

so anyone with the renntech tune for their c350 had their gas milage ruined also? before doing the tune I would average around 21 -23 mpg but now Im down to 11. that is with normal driving. I live in atlanta there is no room to really open her up. car has 24k miles.

aamirani

I would 100% contact Renntech.

w204_Generic

Hopefully Mike @Renntech chimes into this thread and gives you information about the issue.

adanmtxt1

I wonder if it's possible there's just miscommunication between the engine fueling and whatever's responsible for reporting estimated MPG, because that's really bad. I can't imagine with regular driving which while varied averages 11 MPG.

speedraider

contact Renntech before to bash them.

victort

35 miles in 3.5 hours? sounds like a lot of stop and stop and little go traffic. Although 11 mpg is a little low, i also think your average of 21-23 mpg is very high for that kind of driving.

deutschman

Did not bash them. I am very happy with the tune just wondered if getting that low gas milage is normal for that tune.

FxFormat

I like the name of this auction place lol

superangrypenguin

Pardon me for this question as I certainly have never modded my car to increase performance...

Wouldn't these tunes cause the cars to run rich? And if a tune increases HP, then it will cause the engine to consume more gas (and more air). Is this simply not the result of that?

Adi-Benz

Not really. Sometimes you end up getting improved mpg.

I would tell you 100% but apparently EC doesn't have a stock tune that matches my c300 so they can't tune it...

AMG GT C

Mistake