I fueled up Thursday, after a day in the field (oil), with the low fuel warning light shinning and drove 30 miles home. Next day, driving to a new location about 60 miles away, I notice my egt's and boost higher than normal, and my overhead mpg lower. Could this be caused by a bad fillup? I have been using the Supertech 2 stroke oil for the last 4 fillups and it seems to have increased my mpg, as well as smoothing out the engine.