Quote:
Originally Posted by Thymeclock
There is something to this: it's the size to weight to interior space ratio. As the car makers submit to mandated safety standards they need to add more equipment - and that adds extra weight. Weight is the enemy of fuel economy.
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That's true, but so are Rolling resistance, drag area, and engine/driveline efficiency. The most fuel efficient car currently sold and the second most fuel efficient car ever tested here clocks in at ~3k lbs, which implies that ~500lbs or so doesn't make or break fuel economy.