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Originally Posted by Mr Hardware
why are you having the engine rebuilt if you're looking to save 87c on fuel?
Yes 80k the whole way, for two reasons. At 100k your car has to push a lot harder through the air than at 80.
Trust me, my ye olde commodore with its three speeder much prefers not to be pushed. Keep it at 80 and you might even do less than 15L/100klms!
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actually falcon 6 engines usually get best economy when cruising at between 95 to 105kmh,80kmh the whole way is likely to get him cursed at by everyone and hold traffic up to a point where road rage might become an issue,(except the 30 km section either side of Gympie where 90kmh is the limit now,and as for 3 speed what diff is there between a 4 speed and a 3 speed on Hi-way, they both have a final drive ratio of 1 to 1,
best advice xcwillow is buy your petrol at Maryborough where its 5cents a litre cheaper,with your tyres at around 34-36lbs and drive smoothly in each gear,and leave Hervey Bay after 6am so you dont arrive near Brisbane in peak hour traffic.there you go you just saved probably 8cents a litre with those simple steps and with the added bonus of not ****ingoff every other driver around you,80kmh on Hi-way great advice(NOT)