Hubby's work van and our Jeeps can't be converted to diesel.
You mean my 1968 VW bug convertible wasn't enough?
Does 40 gal. of vegetable oil go the same distance as 40 gal. of gasoline?
If so, that would last TCS about a day and a half. I don't think it would be convenient.
Go the same distance? No. By volume the diesel fuel is much better than biodiesel in terms of energy density.
40 Gallons of veggie oil would get you about the equivalent of 50 gallons of diesel fuel or thereabouts. Depends on the method you use to convert it to fuel. (Some people mix it with a thinning agent. Others use a heating system to thin. Both methods will increase the total amount of fuel) Diesel can get you anywhere from 35-55mpg. Depends on the vehicle.
I've not done it personally, but I know people who have. It's time consuming and can be messy, but once you get an efficient system down for filtering the used oil that you get from restaurants, it's probably worth it?I don't have a car anymore, and I don't need it. Life in the big city. Ohhh yeah!
Mine were F-250's and 350's so they drank gas but still got 10MPG better than regular gas. The big advantage to diesel was that I got the same MPG even when hauling/towing fairly heavy loads. Plus a good diesel engine will go 200,000 pretty easily. Hard to order at a drive thru though. 
Yes, he does. A very heavy, loaded full-size commercial van. Also, his equipment runs off the running engine even when the van isn't traveling.
Maybe,
Bruce Willis. If he can save the planet, he can save America.
