My average MPG and distance to empty suddenly went down after the OTT Tune.

It also shows 50 miles less than usual on the digital ‘distance to empty’. The truck drives beautiful now for sure. Completely stock, v6.

First fill up after the tune. I went with the lite flavor. Anyone experienced the same? My thought was the tune would not impact MPG and it will increase it if any.

For context, I drive 80% city, and the 13-14 mpg is not what I get at all, it’s more like 16.5 - 17.5 (before the tune, just as of couple days ago).