While the Highlander was still on the FF I took it on a road trip round trip about 540 approx round trip got 26.(don't remember) mpg going 25.(don't remember) mpg coming back on flat Florida roads. I replaced the FF with with QSUD 0W20 at 5k miles, no mileage checks during that OCI. Drained the QSUD 0W20 at 10k miles refilled with QSUD 5W30 and went on a road trip. It was 600 approx miles round trip about half thru the Appalachian foot hills. Kind of thought the mileage might drop because of the switch to 5W30 or the climbing hills with CC engaged (saw a few trips to 5k rpm). Only check one fill up which covered the whole trip up and part way back but got 27.48 mpg. I can live with that.