[Superfuelgero]

This has been my method for years:
1)Fillup on the fast pump setting, clicks off
2)put on lowest setting, clicks off
3) repeat #2
4)fill until fuel visible
-Stop at anytime if fuel gushes out.

Then follow the typical miles/gal. This has worked well for me over the years over the tankful (56-64). My mgpuino is going in over the Christmas holidays that should validate my data.

Problem:
Recently, I have been using shorter trips 180-250 to separate the town and highway portions of my tank. This gave expected results in town (44.8 mpg over 230 miles) due to the car lines (like a drive thru for picking kids up at school) and high speed (75-80 mph) highway (61.5 mpg over 180 miles). Problem is my normal slow speed highway version (50-65 mph, over 180 miles), is giving me numbers that seem far too optimistic (90.4 mpg). Is there something wrong with my fill-up process?