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sheepdog 44 · 02-22-2013, 07:10 PM

This is just anecdotal evidence, but for the 3 cars i've owned, it seems that after filling up i instantly get better mpg and power. This effect goes away the next day after the car has settled. It's "feels" like enough of an improvement that i'm probably not imagining it. In my previous cars i noticed better acceleration. With an instant mpg gauge, i can see i'm getting the mpg i would maintaining speed, but while i'm slowly accelerating.

Has anyone else noticed this?

Could it be vapor in the gas tank? Fresh fuel? New fuel in a warm engine?

02-22-2013, 07:10 PM	#1 (permalink)
sheepdog 44 . Join Date: Dec 2011 Location: Salt Lake valley Utah Posts: 923 Thanks: 114 Thanked 397 Times in 224 Posts	Better mpg after filling up? This is just anecdotal evidence, but for the 3 cars i've owned, it seems that after filling up i instantly get better mpg and power. This effect goes away the next day after the car has settled. It's "feels" like enough of an improvement that i'm probably not imagining it. In my previous cars i noticed better acceleration. With an instant mpg gauge, i can see i'm getting the mpg i would maintaining speed, but while i'm slowly accelerating. Has anyone else noticed this? Could it be vapor in the gas tank? Fresh fuel? New fuel in a warm engine? __________________ I try to be helpful. I'm not an expert.