My 1954 3100 with bored 20 over and a t5 transmission and a nova rear end with 2.73 gears, I swore for years that I was getting 20 miles to the gallon on trips. NOT SO. when I figure my electronic speedometer was miss programmed. NOW around town 13 14 on a trip 15. So I don't kee[ a record and jus put gas in as needed.
