he is getting 19-20 mpg's he has a 10 gallon forklift tank and gets right around 200 miles on it.  I believe that you can fill up at propane distributors,  I believe it may actually be cheaper to fill up at a gas station because then you are not paying road tax but I may be wrong.  I called a local propane distributor (Pacer Propane) and asked them what it cost per gallon for a vehicle and it was $2.28, gas stations were at $2.25.