55MilesPerHour

When the original national speed limit came into effect in 1974 after the first Arab oil embargo, it was designed to cut back on gasoline usage. Even though the national limit was repealed in 1995, the old double nickel is a perennial topic and it reared its head again after the EPA announced ...

Everyone's probably familiar with the idea that engines in cars produced today are tuned to burn gasoline most efficiently when the car is moving at about 55 mph, right? I thought I'd heard that some newer cars were tuned for a slightly higher speed (60 or so), but I haven't been able to confirm ...