WalleyeMikeIII
Full Access Member
This matches my experience perfectly, including throwing in about 15% of the miles towing my 4500lb boat on the highway. I have only ever run Premium in mine.My '23 Suburban HC with 6.2L trip-2 meter has never been reset since leaving Arlington factory.. so Hwy miles, rural miles, city miles, idling at drive-thru windows, occasional 10 minute morning warm-ups and etc is a Lifetime combined 16-mpg using only good Premium gas.
.