I went to Melb this Weekend and filled up with Gas at Calder Raceway and it took 112 Litres to fill the Gas Tank from empty. Usually it only takes105 Litres.
I did not worry about the extra Gas as I still had 50 K's to go before I parked it.
I just recently put a Reconditioned Head on (290,000 K';s). This Head had the Inlet Ports enlarged which allows better breathing and has made a big difference in the Power.
I always run a Tank of Petrol through to every 4 tanks of Gas. Also my Patrol starts on Petrol and switches to Gas automatically after a short warm up.
Been tempted to put on a Larger Exhaust System but the Truck is only used once or twice a month for Camping and Fishing trips.
Should outlast me Ha Ha