Alternative fuels living green

I was wondering if there were other alternative fuels out there that requires minimal modifications to the car’s engine outside of biodiesel or hydrogen peroxide?

Someone else asked about hydrogen peroxide on this site and I looked up H2O2 already.

How much does it cost to produce ethanol and biodiesel and any other alternative fuels that you can think of compared to gasoline?

If not, what kind of alternative fuels will, or what modifications do I need to make to my engine to run the biodiesel. I have an F-150 V8

I checked on mapquest for stations that produce alternative fuels and I only found one station in south florida that carries biodiesel fuel. That particular station is far from where I live, so how can we get one in our area? Also, do cars need any modifications for this alternative fuel?