My gas mileage with Stage 1, K&N drop-in, and AMX airbox-to-turbo pipe has varied very little: 21 - 24 mpg. My average is 22 mpg. Even with extended, easy (65 mph) highway driving, the GT doesn't get more than 24 mpg. These figures are based on 9K miles with the aforementioned mods.
GG
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