Outer Limits 4x4 Board

What fuel consumption can I expect from the old 22r on petrol and lpg?

Petrol I get around 15-16l/100km around town which seems to be about the norm as they like to drink

Ive had LPG fitted and the first couple of tanks seems to be using around 23l / 100km. Does this sounds excessive or about on the money? LPG is still cheaper to run than petrol, Im just not sure if it should be better?

My 22R was getting around 17l/100km on gas, and was around 14-15l/100km on petrol for comparison... Oh, and also around 1l/1000kms of oil, yeah, she was stuffed...