I was trying to use the US average. A 15 mile commute each way is about 1 gallon of gas per day. I thought that was 7 lbs, but my memory was incorrect as that

I was trying to use the US average. A 15 mile commute each way is about 1 gallon of gas per day. I thought that was 7 lbs, but my memory was incorrect as that is the density of diesel/jet fuel. Gasoline is closer to 6 lbs per gallon as you say.