beat OPEC by using vegetable oil in your car?

An interesting webpage for those considering this option.

As for other means of improving your mileage without using more traditional fuel, a episode of Mythbusters screened about 5 years ago found:-
- None of the devices tested that claimed to improve fuel efficiency actually did so
- some things like adding acetone actually reduces it
- hydrogen fuel cells that take hydrogen out of water don't produce anything like enough hydrogen to run a car

But as mentioned in an earlier post, the way you drive makes a big difference on how much fuel you use.