You will save 35% in fuel costs alone.
I am aware that when users find more horsepower they tend to enjoy it and trade saving more for pleasure of racing and speeding tickets, wear and tear on tires etc. Lead foot equals less fuel saving. I drive extremely conservatively with my super charged Jag, and couple of beamers. I drive in the sweet spot to maximize mileage and savings in every area, not just the cost of gas. Hydrogen should have gone main stream 100 years ago and the world would be a different place today. Oil investment won like VHS tapes beat out Beta tapes. Everything has its time. Where are the tapes now?