I consider your mileage/oil consumption rate to be about average...."To be expected", if you will.

If she is your daily driver, it's time for a full overhaul. If she is your playtoy, drive her til she breaks.

Go ahead and do the compression test, but what you find will confuse you enuff to get you chasing your tail. One or several cylinders will be low. From there you can play Sherlock and try to narrow it down to rings or valves and all that. But at 225K, don't bother.

Cheer up. Take a sober, good honest look at her.(I had to do this with all my ex-wives). Decide if she's worth your time and a thousand $$ investment. If she is, then plan and budget for a complete rebuild. Myself, I elected to divorce them. Hey, I did all my own legal work and managed to save my house, retirement and 401K.....Maybe you can salvage this marriage tho.

If you decide to try, allow engnblder to supply the parts and Wiretender and Esquire to show you how.