NasaGT said:1) You're driving it harder???
2) Are you using the Predator tune? Where you using it on the 03? Different tune = different results.
Hmm I thought the 04's have 3.55 axle ratio standard. If so, that's the reason.codyGT said:Does anyone know why the MPG changed in 04?
My 03 GT = 18/26 M5
New 04 GT = 17/25 M5
