Hey..can anybody tell me about how much mileage the toyota corolla 2009 model new shape will give on cng with a 60kg cylinder...and tell me about neotek advancers and emulator is it good or not..and one more problem is that my car vibrates on cng ...i have installed new plugs also..some mechanic told me that valves are misfiring i have toyota corolla 2009 xli new shape ?:(