A big factor in the reasons why cars don't get as good gas mileage as they did 10 years ago is that they are a lot heavier due to added safety regulations. For example, a quick Google search told me that a 1992 Civic CX hatchback weighs in at 2094lbs, while a 2009 Civic weighs in at roughly 2600lbs. That is 500lbs of dead weight, and that is a lot more work for a small I4.Originally Posted by preferredduck