Quote Originally Posted by eikichi View Post
I just filled up my car with LPG last weekend. After installation, I filled the tank up to 'no flo' at 23.92 liters. Last weekend, full tank was at 37.69 liters. My tank's capacity is at 40 liters only. Correct me if I'm wrong with this since this is just my 2nd full tank, I am assuming that my readings are still inaccurate. My fuel consumption for LPG was around 8.3 kms/liter vs 11-12 kms/liter when I was using petrol. Still trying to eliminate all possible factors one at a time with my reduced fuel consumption. I was expecting to get at least 10 kms/liter. My suspects for the low FC might be a combination of the following.
1) Still using my old spark plugs prior to conversion
2) Changed my driving style to test my first taste of LPG powered car hence the more aggressive driving.
3) Petrol tank is still at full
4) Additional weight from LPG tank and full tank of autogas
5) Extra weight of my existing subwoofer
6) Need for retuning of the venturi-mixer kit for optimized condition

My air filter is the cone type and had it thoroughly cleaned before the conversion. My car is a 98 Corolla GLi.
You should try computing the FC based on the average of a few weeks simply because the LPG refueling automatic stop isn't exact and would fill more on cold days and stop earlier on hot days.

The weight of your car might be part of the cause of the FC result you got if you drive in a more hilly area. IF it's mostly level roads, it shouldn't have that big of an effect.

But my main suspect would be your air-filter. Even when cleaned well, it still result in more restriction than a brand new filter.

A venturi-mixer system seems to be more tolerant to older sparkplugs as long as it's not tuned to run too lean.