This is schematic of my lpg.
With switch i can chose lpg or petrol.
Petrol injectors are high z(13ohm) and lpg are low z(0.9ohm). So for lpg use pwm with flyback
Car goes same like on petrol, average consumption is 8l/100km.
Configs(1.0.73):
TO DO: dual config, so i can change petrol/lpg when driving