i had uberdata put on my turbo 99 si, and it runs terrific but i have recently noticed that i onlt get about 200 miles to a tank of gas from my old 300+????

my o2 sensor is fine and my A/F on the dyno was good, but i dont understand the reason for the low milage.

maybe i should find someone with a wideband that i can drive around with or datalog or something, gas aint cheap nizzles.