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After a good tune-up may other factors affect your gas mileage, tire pressure, acceleration, traffic conditions, driving habits, etc. The only thing you can do is make sure its well tuned, has regular oil changes, clean filers and drive like a 90 year old lady! Outside of that, think about getting a newer more fuel efficient car.
Valve stem seals. Oil is thicker when cold (hence no smoke when cold) Vlave stem symptoms are when engine at idle (high vacume) oil is pulled through the guide seals, when you take off from lights get bit of smoke until oil is burnt. Ring symtoms is it would be blowing smoke all the time especially at higher rpm for extended time ie: driveing. Have you thought of trying a thicker oil? what oil grade do you currently run?
Oil pressure is generally not related to oil level unless the oil level is low.
Oil pressure is created by a pump and as the engine parts wear over time, the oil passes through them easier causing oil pressure to drop.
It is also possible that the loss of pressure is caused by an oil pump that has worn, but don't get your hopes up.
If the vehicle has a lot of mileage, has been driven hard, has not had the oil changed regularly, this occurs.
It is sometimes possible to put additives in your car that are "thicker" than oil and this will give you some time to decide what to do.
use a normal oil cheapest you can get and change it every 6000 miles with the oil filter every third oil change .as for oil getting dirty thats what its meant to do ,and the smell is that synthetic oil and it additives