Premium Gas? in 10 - Present Lexus GX460 Posted July 14, 2017 I did the math over the course of two months. Using 93 octane from Shell or BP in the GX improves overall mileage enough to actually save 1.3 cents per mile in fuel cost. But even if it cost a little more per mile, my butt dyno says the engine runs noticeably better with hi-test. 1
Premium Gas?
in 10 - Present Lexus GX460
Posted
I did the math over the course of two months.
Using 93 octane from Shell or BP in the GX improves overall mileage enough to actually save 1.3 cents per mile in fuel cost. But even if it cost a little more per mile, my butt dyno says the engine runs noticeably better with hi-test.