This would be a great idea. It would also level up GTR class racing (if the limit was set right) so the FZRs would have to try to not run out of fuel (they drink petrol like there isn't any bloody tax on it). A Group C car would be nice, but it could work ever so nicely with the current cars.
Exhibit 1: Blackwood GP, 1 hour 30 mins, WR pace rounded up to the nearest second. (Fuel control online stats)
AFAIK all the GTR cars have 100 litre petrol tanks, so a 120 litre limit in this case would even it up, the FZR will need to pit AND drive to preserve the fuel, the XRR could splash and dash or preserve the fuel a bit, and the FXR won't have too much of a problem unless you drive badly.
Exhibit 1: Blackwood GP, 1 hour 30 mins, WR pace rounded up to the nearest second. (Fuel control online stats)
FZR 130.91% (1 stop)
FXR 96.72% (0 stops)
XRR 100.75% (1 stop)
AFAIK all the GTR cars have 100 litre petrol tanks, so a 120 litre limit in this case would even it up, the FZR will need to pit AND drive to preserve the fuel, the XRR could splash and dash or preserve the fuel a bit, and the FXR won't have too much of a problem unless you drive badly.