Does anyone know how the new cars today are so efficient? It's hard to believe that a Camry with 178hp weighing 3200 lbs gets 25/35 mpg, it's incredible. I'm not even talking about the hybrid. My car weighs 2425 lbs with 140hp and I get at most of 28 mpg on a good day with mostly 65 mph highway driving slowly. I know car engines are inefficient machine. According to this http://www.fueleconomy.gov/feg/atv.shtml , we only use 14-26% of the energy in our gas. I also know that you can only squeeze so much energy out of the engine. just something I find really hard to understand wrap my mind around in with just 10 years of advancement.