I know for the Polo I can fit my dual suspension MTB and my road bike with both wheels of in the back if needed, though I never would at risk of damage during transit. I'm guessing that you probably wouldn't be able to keep the rear wheels on if you put them inside the car. Perhaps when they bring the wagon version out that would do it but I wouldn't be holding my breath.
I use Thule roof mounted racks. Fork mount (front wheel off) for the road bike and frame mount for the MTB as its an AL frame. There's always going to be some effect to fuel consumption but its not a great deal. I'll avg. 5.8 without anything on the roof and 6.7 with roof bars and MTB. Its a bit more when I have two bikes on the roof but I can't remember what that is as its been a while since thats happened.
2011 Polo 77TSI | Manual | Sports Pack | Flash Red | Alpine INA W900E SatNav
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