There's no noticable change in gas.....all i do is shift earlier than usually...for example, i stay on first gear until 10mph, 2nd until 15-20, 3rd until 25-30, 4th until 35-40...so ill be at 40-40+ on the 5th gear...and when im on the freeway i stay 60-70....and it will be between 2000-2400 RPMS...In my opninon,,, that is not bad...i only bash the gas pedal when i want to, and i like the feeling of being push back form ure seat...also, if you like driving 80+ on the freeway consistenly then dont get gears....i usually drive the limit, and thats perfect with the gears... like i said you can still bash the gas pedal and hit 80-80+, man even 100, but you can't stay on that speed for a long period of time...and last, you dont even need to go that fast, just stay in the limit, hey at least ure not ticket prone anymore when u get gears...