1968 Shelby GT 500 KR, Nascar tunnel ram 427 side oiler. Only 900 miles on it since 1970... think investment. 13.5 to 1 compression, think 115 octane or better, expensive to get even 900 miles along.
With probably 6 or 7 miles per gallon on this dual quad gas pump, a 20 gallon tank, and around 8 bucks a gallon, I think it may be close to guess that they've only burned up about 1200 bucks in gas in 37 years. Thats 900 miles in 37 years = 24 miles a year = 4 gallons of fuel a year.