Yes I hand calculate my mpg. I take a 300 mile trip every couple of weeks to a nearby town and after I put the add-ons on my truck, I fill up near home and after I get to where i am going I fill it back up but it only takes close to 15 gallons to top it off.

 

I mentioned this to my truck this morning and he said to pass it on to your truck that it sucks

I did however 1x get my lie-o-meter up to 29.7 mpg coming back from Reno (all down hill from the summit)