Gee, if the federal government ever decided to do something like this, I'd be willing to bet that transportation costs over all would go down.
Imagine if the government chose to pay folks to bike commute vice fund a new freeway or add lanes to existing roads. What a concept.
Rather then give tax credits to oil companies, how about mileage credits to cyclists. Look how much driving is subsidized in our society... with everything from limited access freeways to free parking and even the aforementioned oil tax credits... (and don't get me started on the 6000lb vehicle tax credit... ).
Perhaps it is long past time for cyclists to get some of their share too.