The shorter the distance you travel, the less accurate any mpg reading or calculation will be, particularly if road/driving conditions over said short distance are conducive to good mpg. I have eeked 45 mpg out of my car over short distances, but that is never sustainable. I am also less likely to believe the computer over that distance, even though mine is always 1-2 mpg pessimistic.
2013 V6 Base Coupe - Performance and Tech Packages - Ingot Silver
Bama Tuned with Airaid CAI - GT front brake upgrade - More to come.