Most cars on the road today have sequential injection systems.   The older cars had bank or batch-fired multi-port (MPFI) or throttle-body injection (TBI) systems.  Although all injected cars can be easily converted with a propane injection system, TBI systems generally require a fumigation (mixer upstream of the TBI) system in the conversion. 

A concern many people have with propane conversions is the availability of propane.  Because all EFI conversions are bi-fuel, the motorist never runs the risk of being stranded from running out of fuel.  The only risk is that the propane station on the trip is more expensive than the motorist's favorite station at home.  In Canada, propane motor fuel stations are extremely common, comparatively more so for cheap fuel than in the USA.  Many propane stations in the USA are not set up for refueling cars so their prices are sometimes more expensive than they should be.  To find a refueling station in your area or for your trip, please visit the following directories:

• US DoE Alternative Fueling Stations
• Alternative Fuel Fill Stations and Prices (also lists Canadian stations)
• Propane Gas Association of Canada - Refueler Locations (Canadian stations)
• Superior Propane - Refueler Locations (Canadian Stations)

For trips through locations you haven't been before, it's a good idea to always call ahead to check prices, hours, and availability.