I wouldn't stress over your audio system. Best thing you can do for mileage is slow down. Drive country roads where you can keep your top speed down, or just ignore the fast traffic and let them go around you. My 2 liter cars average 26 mpg at 72 mph, and 38 mpg at 60 mph.
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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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