Beating People on the commute who have a better bike

Another good advice, I can't says I hasn't notice this with my slow and fast bike.

It only work if both your bike don't have computer though.

Yes ... it purely about your perception of how fast you are going.

You end up racing yourself. You get faster on the "slow" bike which causes you to become faster on the "fast" bike which means you try harder on the "slow" bike ... and rinse and repeat.