While I don't currently have a car on the road, I usually do. I generally keep it between 1/8-1/2. Unless I'm going on a road trip where the full potential range of the car is worth using, I prefer to keep my money in my wallet and not burn more gas to lug other gas around. I will occasionally fill it up before major storms.
Interesting theory, but I'm not sure it makes much difference. Gasoline weighs about 6lb/gal, so half a tank is, what, 30 to 60 lbs? I don't think that much extra load affects mileage measurably.
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Date: 2011-03-08 02:43 am (UTC)(no subject)
Date: 2011-03-08 03:11 am (UTC)Interesting theory, but I'm not sure it makes much difference. Gasoline weighs about 6lb/gal, so half a tank is, what, 30 to 60 lbs? I don't think that much extra load affects mileage measurably.