Mitsubishi Magna 2000 Problems

If it smells like it's burning then it is probably overheating. Don't take too much notice of the gauge, because it could be faulty. You need to find out why the fan isn't working, which could be because of a wiring issue, a blown fuse, or a burnt-out electric motor, and get it fixed.

If the computer is correct you should also be stopping at the fuel pump more frequently, if you're still driving roughly the same distance on a tank full of fuel then there is likely to be a problem with the computer. More likely though it's a sensor playing up. It could be the oxygen sensors in the exhaust, or it could be the airflow meter in the intake.

The most common cause of oil excessive consumption in Magnas is worn valve stem oil seals.

There's no reason the Avalon should be any thirstier than the Camry. They're about the same weight and they share the same V6 engine and drivetrain. The Avalon is locally produced, not imported, so the parts are the same price as the Camry's. On the current market the Magna is the best buy in that its used values have slumped, the Camry and Avalon are standing up well, while the Commodore remains popular and hence has good resale value. In terms of mechanical reliability, it's hard to go past Toyota and I would probably prefer the Camry or the Avalon, but all four have good reliability and will do the job well.

Your Falcon would have tested about 13 litres/ 100km when new. For comparison purposes, the Commodore V6 would return about 11.5 litres/100km, the 3.5-litre V6 Magna about 10.5 and the Camry closer to 13. Clearly, on that basis the Magna is the car for you.