I do think the government can slap iron-fisted mandates on the car companies...let's set a deadline for next year, 100% of ALL cars MUST get 40 mpg or better...if they can't make muster, too bad. Time to shut the factories down and recycle the scrap metal.
Same for boat builders...fuel-efficient motors only, onerous "luxury taxes" on boats selling more than let's say $30,000, etc.
Raise taxes on gasoline by a dollar (more to come later, you just can't do it all at once), halt all new road construction *immediately*, and completely fund mass transit, nationwide. Make it free for everyone to use to encourage the switch-over to public transit.
We can't make more oil, but we sure can find plenty of ways to reduce it...another simple method would be to raise interest rates to Volker levels and leave them there for a few years...that'll "demand destruct" the economy in tune with oil depletion...hehe.

Nowhere to run, nowhere to hide...
...and the meek shall inherit the Earth!