BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Gas Mileage gone down with JB2H?

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      02-27-2008, 06:03 PM   #1
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Gas Mileage gone down with JB2H?

I installed the JB2H on MOnday and noticed that it seems I went through the rest of my tank of gas (probably 1/3rd of a tank) way too fast compared to normal. When I filled up earlier today in the limited time I drove (10 miles at most) I reset the MPG gauge and in that time period I am currently sitting at 16.8 MPG, granted none of this was highway....Just wanted opinions from other JB2 owners on gas mileage
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      02-27-2008, 06:05 PM   #2
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I've experienced exactly the same thing I will be removing the "H" as soon as I get some warmer weather.
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      02-27-2008, 06:29 PM   #3
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my avg mpg after installing JB2 has gone up about 1-2MPG under normal driving. I only installed it last friday and has filled up once since installation. Another thing i noticed after installing JB2 was that the temp varies now between 220-245 depending on how i'm driving.

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      02-27-2008, 06:32 PM   #4
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I would say that the mpg dropping is a given after installing a JB2 or any variation of it. You're goiong to have more fun with it especially at the beginning.

Even after normal driving though, I saw a 1-2 mpg drop.
It's a trade off though just like anything else.
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      02-27-2008, 06:35 PM   #5
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I wouldn't give up the safety of JB2 running a little rich for 1-2mpg.

Besides, mine has always been around 15-16mpg avg .
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