I’ve been using auto start stop all the time. So far it says I have saved about 5 gallons over the roughly 7000 miles I’ve been using auto start stop. I’ve noticed however that my mpg noted on the dash is overestimated and that the amount of overestimation varies. When I use an app like Fuelly to document my actual mpg, my cars dash overestimates it by about 1-1.5 mpg. I wonder if someone who doesn’t use auto start stop can let me know if their mpg varies also. I’m thinking the reason it varies is probably because auto start stop thinks its saving fuel but it’s actually not.