Originally Posted by idiotekniQues

The tests have been done already but you can try them yourself. The means you suggest above contain too many variables: two different riders on two different bikes with "equal" ability hard to prove. Try a roll down test with different sized tires or even just the same tire with different pressures. Try climbing a hill and vary tire size or pressure and use a power meter to compare watts expended. Try the rumble strip test using a power meter. Google Jan Heine's blog posts on the subject and see the tests he has done.

In the end though, what you believe makes you faster might have a bigger influence on the outcome than what actually might be faster, all other things being equal.