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high flow exhaust = 3-5% mpg gain?
What no exhaust modifications. Switching to a high flow exhaust muffler or system(ie magnaflow , borla) IS a magic bullet 3-5% increases or more are often seen and pay back can be less that a year of driving.
Also Plus 0 tire increases (ie 225 75 15 tire for 1 205 70 15) will increase mileage because the larger tire rotates slower thus the engine rotates slower. keep in mind that on FWD cars you are limited to how much taller a tire you can install. you must also recalibrate your odometer as it will be turning slower than actual.
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