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Buddy's Fuel Vaporizer #4 Gives you up to 25 - 40% Better Mileage. Only takes 1/2 to an hour to install. Sometimes better gains that adding HHO. Install both systems, FV and HHO. Designed for carbureted gas engines, or fuel injected engines with OBD-I systems (1987 to 1995). Works well with OBD-II systems (1996-2020) will need a Volo FS2 or EFIE modifying circuit installed. Installation photo. If you do NOT add a Volo circuit past 1996 to 2022 cars and trucks, you can burn up your catalytic converter. Check out Darol's Circuits for even more MPG gains! Volo FS2 takes 1/2 hour to install. Volo with OBDII plug, self programs in 3 minutes and just plug into your OBDII port. No wiring or soldering. Go even further with the new Volo VP16, a EFIE and ECM on dashboard Monitor, all in one.