How do you know the type of vehicles we drive? Unfortunately, being in the construction business, tools, ladders, materials etc, don’t fit in a Celica. As for me, I drive a 6 cyl. vehicle. I don’t live in a city, for me to do the things that I have to do I must drive.
If you read what I wrote you would see that I made absolutely no assumptions about the vehicles you drove. I simply presented and easily understood mathematical formula that said, if you doubled your gas mileage, you would halve your gas bill.
I assume that you have done your own calculations as smart business person regarding the price of diesel vs. gasoline and the relative efficiency of each and decided wisely on your vehicle purchases based on that. Right?
Regardless, based on the information you gave me I would be willing to bet you could find a vehicle to replace each in your fleet that was 50% more efficient. Of course, you might not be able to get it in the US because the demand is too low, but perhaps eventually you will.
By the way, have you concerned yourself with the math of US production versus its proven reserves? The US has 21 billion barrels of oil. If it pumps 7.5 million per day, how long with 21 billion barrels last? Maybe you will rethink your drilling scenario once you pull out your calculator.