as I posted before on the ride back from the track in Bakersfield, Laura and I drove the same lane with her following. We reset our odometers at the gas station. I have the NA diff, an NA speed sensor, and stock rims with new stock Dunlops. She has 18" rims with 35 series tires, TT diff and speed sensor. My mileage when getting home was 126.1 miles and hers was 121.8 miles. We avaraged probably 80MPH. My gas guage appears to have a slightly higher reading. Kinda of strange that the NA gears and smaller diameter tires didn't seem to take more gas. I have a less restrictive airflow and a fuel tuned car, she has a perfect running Z as is was from the factory. The only way to really tell would be to both hit up the gas station now to see how much it takes to fill up. We haven't drove either Z since. Just an FYI for those worried about gas mileage when switching gears.
