Craig,
I'll have to agree with Peter. My daily driver is a Honda civic. When I went to Goulburn for the Cobra Nats, I went in convoy with a falcon towing a Cob and a Mach 2 Mustang. Both those cars filled up twice (700kms) on the way up compared to me filling up once (45 ltr tank).
Mind you, that was the ONLY comp I won all weekend!
Cheers