Quote:
Originally Posted by crabu2
how can you get better mpg is the question. because when you increase boost, you're going to increase fueling.
You're saying one might see 1 or 2 mpg increase with a canned tune.. I don't see how that's possible because if your putting your foot into the throttle for more power, which means worse mpg, your basically just running on a stick tune.
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Well, think about it this way. You have a base tune from a JB4, give you an extra.....4 PSI plus everything else it changes in the ECU/ECM. If you're light on the throttle, driving normal at highway speed of 60. Then in theory you shouldn't be using that much more fuel or making that much more power since you're just cruising along.
Thats where people probably say they are getting better MPGs. And to throw this in the loop. In my manual 135i that is stock, I see an increase of 4 MPG if I drive around 75 MPH as compared to ~65 MPH. Now why the hell would I see an increase of 4 MPGs when the RPMs are higher? Turbo'd cars just don't make sense sometimes with their fuel economy.
I normally see 24-25 MPGs driving 65 MPH but when the couple of times I've done some 75MPH trips, I see just over 29 MPGs.