"My old Datsun tried this by itself and it didn't end well....
LQ"
I once had a Toyota Celica that did the same thing.....and I thought it was just a "rice grinder". Go figure!
Put "iron filings" in your engine block?
You might get really good gas mileage for the first mile.
Then, in the second mile, your vehicle and the tow truck combined wouldn't be doing as well.