Arent you comparing apples with oranges here? Compare it to any other R34 N/A out there running on petrol
$80 = Around 400-500km
$26 = Around 400km
you would need to fill up more than 3 times to get to the cost of 1 tank of petrol, and by then you would have travelled 1200km.
The gas system only cost him 2g out of his own pocket and the rest was covered by the rebate, so its wasnt all that expensive.
And yes that 400km was in town driving, no highway tests done yet on economy.
Have you seen the boot in the r34 sedan? lol He has the gas tank in there, a Massive amp and 2 x 12 inch subs in a big box and still has some room to spare.
Cheers