Quote:
Originally posted by damork:
I didn't see thermostat temperature mentioned. I've experienced the best economy when the engine is running hotter, with at least a 195F thermostat, with 21 mpg being my best with the temp gauge sitting at about 200F cruising at 65 mph (not towing).
I've *read* that mileage goes up with higher coolant temps (ala Evans waterless coolant...) and last summer experienced it on my gasser 'burb. Stat failed at the beginning of long trip... Running at a consistent 235* to 240* increased my mileage by almost 2 mpg over similar trips in the past. I almost hated to replace the stat... ;)