Quote:
Originally Posted by qwikz28
I've been running regular in my CTS since I got it. Did two premium fill ups and noticed no difference in performance or MPG. Manual says car will adjust for regular, so that's what I do and I drive that thing very hard, which is probably why my lifetime average fuel economy starts with a 1.
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You might have to do a few tank fulls and more pulls on premium. It probably lowers boost and other things when youre on regular. I know my cobalt hated regular lol
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1986 Honda VFR750 - 89.3HP to the wheel
2000 Trans Am M6 - Mods: Yes.
2018 Durango R/T - AFE Intake, JLT Catch Can, Stainless Works Catback, Vinyl Dodge Racing Stripes
2003 Toyota Matrix XRS M6 - Lol
