Dollars per year incurred to operate a vehicle given 15,000 miles travelled would be a good yard stick.
Most people know what they can afford in their budget. With mileage ratings they have to do the math.
No they don't.
Problem with that is how do you estimate it? Gas prices vary dramatically by location and by time. It might be $2.49 at the place across the street, and $2.39 3 blocks away but next week there won’t be anyplace in town that’s under $2.50 and if you go two towns over hope you didn’t need lunch because all your money is going in the gas tank.
MPG really is the best measurement. If they were going to make a change I’d say they should add tank size and miles per tank. That’s really how the consumer interacts with their gas tank, they fill it up, run it almost dry and fill it up again.
“Why not give people a more useful yard stick with which to compare vehicles
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1970 Cadillac Sedan Deville, 4 door, 500 cu. in., loaded pulling 6X12 tandem trailer packed full. 17 mpg at 70 mph.
Best mileage I have ever experienced.