Yesterday I tried something new for me. I cleaned out my two electrolizers and replaced my electrolyte with a mixture of 1 part vinegar and 3 parts distilled water. I am tired of baking soda or sodium hydroxide blocking the hoses and fittings. I drove the car roughly 200 hwy miles over interstate and secondary roads. Again with big hills. One hill is a 7% grade for roughly one mile. I could tell my mileage had increased just by the fuel gage, so I filled up and reset my odometer in San Antonio before returning home. This was a trip of 60.0 miles between fillups and was over Interstate 10 from San Antonio to Kerrville, Texas. Had to fill up here as stations closer to home were closed, due to late hour. This again has lots of big hills and was run between 65mph and 70 mph. I fill up untill fuel is sitting abover the flapper in the filler neck to achieve consistency. This yielded a mileage of 34.9 mpg.
2001 Ford F350 7.3 Crewcab, Dually, FWD