Milage issues on my 99 4runner

What did you think was going to happen? The s/c and headers allow the engine to flow more air, so the computer is feeding more fuel to the engine to compensate for this.
If you want more power, you've gotta give up some fuel economy. Thats just the way it is.

say what???

dude, do you know what you're talking about???? Supercharger + headers = better flow!!! It's suppose to increase milage! Man, don't mean to sound rude but you got your sh!t all wrong.

I have to agree with Captain on this one. When you start making performance mods toa car you are typically going to see some kind of drop in fuel economy. Also are yousaying that adding the S/C ad the headers are not going to increase flow. You ended that stement with several exclamation marks like you didnt feel it was true. and started out by asking if he knew waht he was talking about.

Have you thought about the possibility that you are getting on the gas more since you got he headers put on.

ALso figuring gas mileage based on how many miles per tank is not the best way to go about doing it. You need to do it by clocking your mileage between fill-ups. Every time you fill up divide your mileage by how many gallons of gas you put in. You need to do it over the course of several fill ups to get a fairly accurate estimate though. Maybe you are filling it at different times. Maybe one time you have 5 gallons of fuel in the tank and the next time you had 6 or 7 gallons left.

Absolutely.

Performance != Fuel economy

dtliao said:

dude, do you know what you're talking about???? Supercharger + headers = better flow!!! It's suppose to increase milage! Man, don't mean to sound rude but you got your sh!t all wrong.

Click to expand...

:bullshitz I think youve got it all wrong. The more air you flow, the more fuel the computer will feed to the engine to keep it from running too lean.

My 4runner was supercharged, terrible mileage. Sold the S/C a few months ago, and now I get an astonishing 25mph highway....for a 2002 4runner with huge tires!

Performance means less reliablity, less mpg. Face it, u want more power, u need more fuel.