What are the effect of the following on demand for gas/oil/highways/airpollution?

1. a 900 annual tax on vehicle that gets less than 20 mil/gallon
2. 2000 annual income tax credit for owners of hybrids
3. income tax surcharge that lowers disposabl income to reduce demand for auto travel and to finance improvements
4. a 50% tax on retail gas, the proceeds to finance subsidization of mass transit system

Please proofread your questions.

What is a 900 annual tax ?

What is 2000 annual income tax credit for owners of hybrids

How would this work?
income tax surcharge that lowers disposabl income to reduce demand for auto travel and to finance improvements