Hi there, Just installed last week, and i have re-fuelled once, still waiting for my 2nd calculation. but for my first calculation i noticed about 20-30 % performance loss than my average with petrol on the same routes for 330 kilometers, which include 50% highway and uphill routes ( and downhill on return, it s a round trip route) What engine is your camry 2007 ? I ve been reading some resources from the web for optimizing engine setting for LPG : 1) Air Fuel ratio 15 something opposed to 14 something (on petrol) 2) Timing Advance 10 degree opposed to 12 degree (on petrol) I wonder if above asumptions are correct and can I manually set the values, or does the engine CPU (engine : 2AZ-FE) adjust the value dynamically ? I monitor from my Torque Pro OBD II Scanner as the vehicle runs : (Air Fuel ratio varies from 14-15 and so does the Timing Advance varies from 8 - 12 (on idle RPM) and change to 20-30 as RPM gets higher ) can any body give me some clue ?