Check your car manual before you splash out and install a roof rack to carry your bike as there are weight limits.Not so much a problem with larger modern cars with ABS but older smaller cars may struggle to carry two heavyish bikes.Could make them unstable and possibly invalidate your insurance...
Bike on car roof rack = buggered bearings?
"Roof rack hits fuel economy by about 20% - we got c40 out of a Golf TDi whereas you'd hope for closer to 50. I'd be surprised if a rear rack didn't have some impact anyway."
As I say, we never drove far enough *without* bikes and racks to work out what the impact was. However, looking at VW's combined fuel economy stats for our current vehicle (and what we actually get) vs the same engine in a Golf estate I reckon my estimates were not too far out.
It's worth working out the real cost of that - assume drop of fuel consumption from 50 to 40mpg. Assume 5000 mile p.a. with bikes on the roof. Current price per gallon of diesel is £6.50 (at 1.43 per L). With bikes on the roof you've used an extra 25 gallons at a cost of £162. Not a huge amount in the bigger scheme of owning a car and running a bike.
Thanks for the comments and suggestions. Final solution: bike in the back of the car, I'm on the roof rack, dog is driving.
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