Absolutely. But I already had the car, and it was later replaced due to old age and not due to distance driven. But the baseline metabolic burn of the 20min car ride should be taken into account, and was, since I was only comparing the extra meal I had to eat vs the extra gas I would have burned.

The total impact of the fossile fuel production chain is something I've been looking for, but not found any good numbers on yet.

I assume that petrol from saudi shallow wells is drastically different from canadian tar sand?

Anyone with reliable data on this?