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Highway driving at 70-80 mph in my 03S 6 speed is 27-29 mpg, very reliably, checked over many tanks. The higher end is when I can find real gas, lower when it's an ethanol mix.
recent highway trip- 28.6, 26.9, 27.0, 28.8, 30.5
3000 +/- rpm at 70+ in sixth is my typical range
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