The last thing i really want to do is cause friction amound hybrider's but i really have to say....is it really that big a deal to gain 1 or 2 mpg because of a bike? I know were trying to conserve and just by the fact we drive Hybrid's, proves this. I appologise if i misunderstood the question, but i wouldnt worry about it. Get your bikes there safe and dont worry about a few mpg for 1 trip. Once again i am sorry if i misunderstood the question. Have a good trip and be safe. Dean