I know others have posted, but to add to the discussion, we just returned from a 3200 mile round-trip from San Antonio to Fargo, North Dakota to San Antonio Averaged 26.0 mpg. We used mostly E-10 gas, but one tank of #E-15 and two tanks of non-ethanol gas. Because of crazy Texas weather, the last two hundred miles we had a head-wind of 30 - 40 mph. Speeds were mostly the posted speed limit. Car is a 2019 Subaru Ascent with 22k miles now. Gas price ranged from $3.89 when we started to $5.07 (non-ethanol) (mostly $4.69 and $4.79). Question: We had a maximum oil temperature of 216. What is maximum safe oil temperature without towing (or with towing)?