I fear that the Demon is not an economy carb that´s why I look at the Predator.
Frank
Been there ,done that...If You think that a Predator is more of an economy-carb then that Road Demon THINK AGAIN,had one (first model=NO idle/low end-circuit,the one's that have that circuit may be a bit better...)on a 258 AMC with Crane cam and hedders some years ago and man did that engine like gas or what,with an easy left-foot and brain set at idle it still wanted 2 liters/10 km if You put Your lead-foot on and set Your brain at race-mood it easily will take 3-3.5 liters/10 km,but at that time the gas price was 30% lower than today so it wasn't that bad...
/Hans aka Speed Swede