Just filled up a full tank of gas in my maxima and crunched some numbers. Drove 251.5 miles stop n go on wawa gas and put in 13.915 gallons. That equaled about 18.1 mpg. My prior fill was sunoco ,my car averaged 19.1 mpg and i did more vigorous driving. I have always noticed this with wawa gas. Both my cars consume it faster and my kia hates it. IM gonna do this with the current fill of wawa gas and see what mpg it will average.