The Bassani will do more like 15 hp and the Steeda pulley's like 5-10 tops... go with the Bassani. I have both for my '97 Cobra. As for gears, I went with 4.30's because I thought with 3.73's or 4.10's would have me saying "I wish I went with 4.30's" so that was a good choice. In terms of fuel economy, in the city you will basically lose nothing and on the highway 1-2 mpg loss. Once you get adjusted to the new gears in the city you really won't use any more fuel, you will just be in a higher gear quicker hence your RPM's are about the same as before. City gas mileage is contingent mostly on how much you get on your car... could be 10 mpg if you are redlining every gear or 20 mpg if you shift at 3k every time maybe. Highway driving with 4.30's isn't bad if you stay in the 70's... if you constantly drive 80-90 cruising speeds your RPM's will exceed 3k which can both be annoying and use more gas than one would wish. GL!
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