Originally posted by Materdaddy
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Thats not entirely true. If you have a heavy foot then yes you will use a hella lot more gas, but if you drive nice and easy then a turbo can help in gas mileage. But it also depends on the amount of power you want to run... the more power you want, the more gas you will use, and the harder on things that it will be.
I'm building a turbo'ed Honda Hatch, and a friend of mine has a turbo'ed Civic. My friends Civic is pushing 275whp@7psi which is 110 over stock with his motor swap. If he stays in the throttle he is down to about 12-15mpg, but if he drives like a normal human being he still averages around 35mpg.
Another thing that determines your power and gas mileage is what turbo you use. A turbo that spools too fast will be in boost at lower rpm's, which could in turn cause you to use more gas since your running in boost while on the highway. But if you run a turbo that spools at higher rpm's then you wont have that extra power unless your running high r's.
I'm not exactly sure how a Jeep would work out with a turbo, theres a lot of tuning involved with my Honda just to get it running properly and efficient. It's more work than people realize, and takes a lot of dedication and maintenance to keep a turbo'ed motor running right.
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