Originally Posted by jdcampbell
The other aspect is that roof mounted will damage economy. On my wife's car (VW Touran) 4 bikes on the roof reduces economy from 47mpg to < 35mpg.
Wow that's quite a hit! Still, you'd have to do quite a few miles to make up the difference in cost compared to installing a towbar and fancy rear rack (which would have a mileage hit of its own).