On Tue, 20 Oct 2020 13:21:29 -0700 (PDT), "
wrote:

On Monday, October 19, 2020 at 3:51:00 AM UTC-5, J. Clarke wrote:
On Sun, 18 Oct 2020 22:40:32 -0400, Clare Snyder
wrote:
Be careful with the "extra mileage". Depending on where you are
diesel can be a good deal more expensive than gas.
The difference in mileage will almost ALWAYS be more than the
difference in price because the price is "loosely" based on price per
therm, and deisel is more energy dense than gasoline. (one part of the
reason a diesel is more efficient)
No, the price is based on the amount of tax the government wants to
charge.

Federal gasoline tax is 18.4 cents per gallon. Diesel federal tax is 24.4 cents per gallon. Each state also charges taxes on gas and diesel.

States are usually a bit higher on diesel tax than gas tax. But not always. And the amount difference can be a few pennies or 15 cents different. So it varies by state.
https://www.taxadmin.org/assets/docs...h/Rates/mf.pdf

In general diesel pays more tax. In general its 15 cents more per gallon with both state and federal. Where I live that is about the difference in price per gallon at the pump. Factor in the 10-20-30% better efficiency of diesel motors over gasoline motors compared to the extra 7% cost of diesel per gallon (0.15 / 2.30) and you are going to have to drive a lot of miles to make diesel pay for itself. Or really need the extra power of a diesel engine.

You clearly do not live in New England. I have seen $1.00/gallon
difference between diesel and unleaded. Investigate and it's state
tax.