Premium Gas Only in 90 - 00 Lexus LS400 Posted November 12, 2007 Has anyone actually "tested" the theory that running on regular unleaded cuts your fuel mileage? In my LS400 98 running on regular gives me 1 mile per gallon LESS of mileage. Tested 700 miles on Premium against 600 miles on Regular
Premium Gas Only
in 90 - 00 Lexus LS400
Posted
In my LS400 98 running on regular gives me 1 mile per gallon LESS of mileage.
Tested 700 miles on Premium against 600 miles on Regular