1990 Toyota Camry Automatic Transmission Problem

I have been calculating my MPG the way you mentioned above for years. That is not the problem, but I think the new mechanic is right. I may have been testing the difference during the break in period, which may have cause different mileage feedback due to other reasons that just the gas. Just got a call regarding the repairs. They're going smoothly and will have a good chance of getting the car back tomorrow. I have been driving my husband's Tundra for the past three days - what a gas guzzler!!