One thing that is getting forgotten, you need to add the costs up for the injector cleaner, OB2 scanner, any additives, etc. Doesnt increase or decrease mpg but it does increase the cost per gallon. Kind of like getting a Honda to drive instead of the X.....add the $ cost for extra registration, license, insurance, maintnance, etc ....thats a lot of gas you can pay for and just drive the X at the lower mpg.