Now that we're driving a Wrangler Altitude Unlimited instead of the Cherokee Trailhawk I have not seen any tank get over 20 mpg US. Most are in the 19-19.5 mpg range, but that is when we are on a trip, with the truck rather heavily loaded, and doing a lot of ups and downs in the mountains between here and eastern B.C. I don't check the mpg driving around town as I'm afraid it would make me cry. That mpg is on 87 oct though and we always ran the THawk on 89. I'll try a few tanks of 89 in the Wrangler and see if the mpg improves. - Cheers, Ted
('14 cherry TH V-6, Comfort/Tech/Tow)
'15 Wrangler JKU Altitude, loaded.