1970 v 2013: How the Darts Stack up

You all left out the fact that the gasoline of today is not the gasoline of 1970 and with that said, the gas mileage suffers in yesterdays vehicles compared to today's vehicle. Maybe the trip should installing a today's engine in yesterdays vehicle as what is done by some. Heavy metal compared to composites should straighten out most problems associated with mileage and power.. I'm no purist and if it wasn't for technology, we'd all be writing letters from our typewriters instead of using the World Wide Web..