For those who always suspected that the automakers could produce a more fuel-efficient car if they wanted, well, you’re right, and the proof is going on sale this year. We’re not talking about electrics, although they’ve been getting all the attention in green circles lately. We’re talking about old-fashioned internal combustion engines in perfectly conventional cars that are getting 40 or even 50 miles per gallon, like the Chevy Eco-Cruze.

So where have these cars been all our lives?

A lot of environmentalists seem to have the impression that the internal combustion engine that’s been powering cars for a century has gone as far as it can. But that’s actually not true. In fact, the last