how to increase mpg in a G37
The only way for sure the MPG can be increased in a G37 is to play with the gearing system. By changing gear # 3, 4, 5 in the transmission will result in a higher MPH at a lower RPM. Gear #3 would be ideal for local stop and go driving while gear #4 & 5 would be for highway. This is the same gearing method used in corvettes which allow them to achieve 25 to 32 MPG without having to pussyfoot the gas pedal. At 80 MPH, the vette engine turns at 2100 RPM, thus drastically reducing fuel consumption. Another method would be to change the Rear differential gear by replacing it with a smaller gear. If anyone knows where these parts can be purchased in the USA, it will be worth their while.