According to the United States government, the average fuel economy for new cars and trucks needs to be at least 54.5 miles per gallon by the 2025 model year. That’s more than double the current average of 25.4 mpg.
That deadline is still 10 years away, but in vehicle-development terms it might as well be tomorrow. That’s why we’re seeing the explosion of hybrids, electric vehicles, turbochargers, and *ahem* diesels in this country.
One company has taken a more subtle approach and devoted itself to getting impressive efficiency from the humble 4-cylinder combustion engine.