Took the hatch out onto the highway today, drove for about 25 mins doing between 60 and 70 mph and still only got up to 33mpg. I also filled up the tank with 3.2 gallons and avg 31 mpg again. Also for the first time that I can recall, the start up sounded off and there was a smell of gasoline in my car that didn't dissipate until I drove a mile and turned the circulation to non-refresh. Did my engine just flood?