Roof boxes reduce mpg: Tests prove carriers cost

Roof boxes reduce mpg

No, that’s not an outboard motor on the back. It’s complicated test gear to prove the real cost of a roof box (Picture © What Car?)

With the Easter holiday in full swing and many drivers needing extra carrying capacity in their cars, a new investigation has proved that roof boxes reduce mpg. The test, conducted by authoritative magazine What Car?, tested a pair of popular family cars first without a roof box, then with one. Fitting the load lugger reduced economy by more than a third on one of the cars.

While roof boxes appear to reduce mpg, we’ve got some handy hints that drivers can deploy to help limit that decrease in economy.  Continue reading