My Truck when switched to Gas always starts on Petrol and switches itself to Gas after warm up. Yours should do the same.
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Mine is a GQ with 4" lift, winch and winch bar,drawers fully loaded, fridge, 33s and my fat arse and still gets 16 to 17ltr/ 100 out of an LS1 5.7 so very happy lol
Just tested the 4500 GU on Petrol and around town achieved 17.96 Litres per 100 K's.
Run it on Gas most of the time which is a damn lot cheaper than Petrol
Depends when the LPG system was fitted Kat - mine doesn't even do the "pre-squirt" of petrol when starting on gas, so I have to start on petrol when cold, wait till it starts to warm and then switch to LPG - it was installed in 2007. Mine isn't gas injectors either.
Mine was 2001... On "LPG" it started and ran on gas, on "Petty" it started and ran on Petty. With LPG selected it even disabled the Fuel Pump as I split an injector feed line crush seal one day and Petrol spewed everywhere (scared crappola out of me, how it never flashed over I'll never know) left it on LPG and I drove it that way for a while till I got a chance to fix it.