Fuel mileage mods and alternative fuels

My usual daily driver was a '95 Ram 2500 V10. The best I've ever seen is 14mpg all freeway driving. I've been averaging just about 10mpg and putting over $100 per week in the tank. Needless to say, that wasn't getting the job done.
Fortunately, I had a '79 Kawasaki 1000 sitting in the garage that I hadn't ridden in years. The bike looks brand new and has killer paint but who knows what's now living in the engine. I took it into the shop and told them to get it running. The first question was, "How much do you want to put into this?" I answered with, "How much are you thinking?"
Turned out to be $1200, including current registration and insurance, to get it perfect and now I'm getting close to 40mpg on a daily basis (as long as the sun is out and the roads are dry - won't ride in the wet anymore). The gas savings alone will pay for getting the bike back on the road in about 3 months. It's all gravy after that - and more fun too.
The Ram is now parked except for when it's needed.