Originally Posted by rrrrrroger

The flaw with that system is that the numbers are less variable. For example:

0.4 gallons/100 miles (VW 2-seater)
versus
1.4 gallons/100 miles (insight)

Those numbers don't sound very impressive to the buying public. There's really not much difference, and the average customer would go "eh" and be underwhelmed. But if you say:

240 mpg (VW 2-seater)
versus
70 mpg (insight)

Now that sounds impressive! The numbers are significantly bigger and make people go "wow" when they hear them. And thus I'd rather stick with MPG because it's easier to sell, which means it's easier to convince people to upgrade to more-economic cars.