Kid Not sure where you got your information but its not accurate. I live in Flagstaff Az. 7000 feet, thats a mile and 1/2 up AGL. I adjusted my oxygen sensor to max. and my 51 1/2 ton purrrs like a kitten. Its a myth. D@C
1951 Chevy 1/2 pu Restoration/stock Deluxe Cab Five window