Truckster (Vic) replied:

it would pull it easily

fuel economy, impossible to say too many variables.

howesy replied:

find out what the straight petrol heads are using in fuel and add 20%.
you burn more gas than petrol. It used to roughly work out to save me 30% of my fuel cost on gas but price has changed since then.

Pezza (Bris) replied:

Average for petrol GQ's seems to be around 5.5km/lt ( 18.18lt/100 ) on petrol and 3.5km/lt ( 28.57lt/100 ) on gas, these figures are whilst NOT towing. I think the petrol figure goes down to somewhere around 4 km/lt ( 25lt/100 ) towing, not sure about gas, but you should be able to work out an average from here.

Avagoodn
Pezza

donks1 replied:

figures should be pretty close

my old work van ( L 300 ) was on gas and had it retuned on dyno

figures came out 2hp different between gas and petrol

just get it tuned by someone who knows what they are doing

donks

Voxson (Adelaide) replied:

my figures are 90litres of lpg to travel 365kms not towing....
90litres got me under 300kms whilst towing a 1400kg trailer...