If anyone is seriously thinking of doing a propane conversion for the FIRST time, give me a call.
James Wan could win an oscar for a movie about propane conversions!

One might also consider:
Energy:
87 octane regular 116,700 BTU/gallon
87 octane E10 111,730 BTU/gallon
propane 91,500 BTU/gallon
Octane (AKI):
87 octane regular - 87 AKI
propane 104.5 AKI
And what is the compression ratio of a stovebolt???
Also, costs:
Missouri has a propane vehicle license fee, in addition to the normal vehicle license fee, for vehicles using propane for propulsion. Check your own state laws.
Jon.