GodStang - don't know about RPM change, but MPG issue depends on the type of driving. City driving will be about the same because you get in to the power band faster so it equals out. Highway driving will be worse because you are running at a higher RPM to maintain the same speed. The difference should not be much. Similar to the difference in MPG when traveling at 70 compared to 60.
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99 Mustang 3.8L, C&L mass-air system, GT dual exhust and rear bumper, Maximum Motorsports 4-point K frame brace, full length sub frame connectors and strut tower brace.
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