Should losing gas affect my mpg readout?


New Member
My gas gauge is going down too fast, but the display is still reporting reasonable mileage.

I had an oil change where the maintenance signal had to be reset recently, but otherwise nothing has changed.

My first 80 miles ~42mpg are reported, but the gauge is only around 5/8.

If somebody stole gas out of my car or there was a leak in the gas line, would that affect the display?

Either way I could use advice on a locking gas cap if you have one or know about them.