[dcb]

sorry otb, but putting ONE gallon in your tank and claiming 52mpg is a bit of a stretch. Many nuances to refilling consistently. I'm glad you are tracking though, really you need some sort of instrumentation though, (and well controlled A-B-A testing even better) and a solid description of the test conditions so that someone else will
A. have good reason to believe the results
B. Want to try the modification being tested

I appreciate that it is a lot of work though, and I too am just as likely to just slap the occasional thing on and hope. Just please do not give too much credit to any one mod without going through the effort of eliminating other variables.