Why is my fuel economy so bad?

I have a 2000 ford falcon forte petrol engine, and it's fuel is still terrible, I've had a fuel service done, a fuel treatment done, even an transmission service done. The transmission service did a hell of a difference, but it's still not fixed. The diagnostic scan came up empty, ruling out any electrical problem. What can it be?

Could be many things check your brakes

Sorry I can't really help you with your question but I just wanted to comment on what Allan said.

The falcon engine does NOT fire on two cylinders at the same time. The firing order is 1,5,3,2,6,4.

My 1996 Falcon was running very rough and drinking fuel until I replaced the spark plugs and plug leads. The six-cylinder engine fires the spark plugs on two cylinders at a time. The cylinder on the exhaust stroke being unaffected by this. If one plug or lead is faulty, it takes out two cylinders and wastes fuel.

Exhaust restriction, incorrect temps, computer does not want to say it is bad! How is your power!

Tyres, transmission… Its a straight six and old not going to be ecomomical

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