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Octane Recommendations for Highlander
I have 2006 Highlander AWD 6cyl. I only get 12 mpg. Veh has 4812 miles. I use 93 octane only. Tires are fine. No problems otherwise. Rarely use A/C or defroster. Some street and highway driving. I work midnites so no traffic to sit in. Otherwise no mechanical problems. I have a 2002 Highlander FWD 6cyl 37k and that gets 20 mpg on 93 octane.
Dealer suggests I use the 91 octane (as the manual says) Said that it may actually be too 'rich'. Found that weird but......
Any thoughts... Thank you!