Ok I was wrong about tire size , I went from 215/70 15 to 215/75 15. What I call city is actually a combo of city and highway. I drive from San Jose to Aptos. So there’s hwy17 in off commute hours and city San Jose and Aptos.
I set travel odometer at fillup and check after gallons of fuel and miles driven.
Maybe I’ve been spoiled all this time with mileage.