Toyota Camry Engine Problems

I HAVEN'T had any experience with the additives, so I can't recommend them, but they wouldn't do any harm. The cause of the smoke is likely to be worn valve stem seals, which allow the oil to run down the valve stems and into the cylinders while the car is sitting overnight. The puff of smoke is the oil being burned when you start up. Try the additives, but think about getting the valve stem seals replaced as a long-term solution.

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.

The Commodore will need an upper cylinder lubricant added to the fuel if you run it on ULP. The Toyota should happily run on ULP without any additional lubrication.