gas tank mileage

[mchaz27]

When i fill the gas tank i always reset my mileage or trip meter . I notice that sometimes when i fill the tank it will say 360 and sometimes 388 is this common to flucuate in such an amount . I always fill the tank up an dalways with high grade gas. Any and all help is appreciated nothing wrong just bothers me to see such a differance .

Thanks ,

charles