+1 on your oil burning issue - very common. I would suggest to stop using synthetic oil if you are burning it at that rate - the synthetic is great if the engine doesn't burn it, but it's doing you no good to put super-expensive synthetic if it's going to go up in smoke (so to speak) before it needs replacing.
If you have a K&N style oiled air filter, that might be the cause of your CE light. The oil fouls the MAF, so you either have to keep cleaning it or go back to the OEM filter (which a team of engineers decided was perfectly adequate).
Good luck!