If it were me, I'd add 8 oz of Marvel Mystery Oil to the oil 500 miles before each of your next oil changes... and use it in the fuel too... 4 oz to every 10 gallons of fuel is recommended... sometimes a little less seems optimum for fuel mileage as it seems to vary by engine, so 3 oz per 10 gallons might be best in some cases... and after a while you may just use top tier fuel to keep everything clean with an occasional run of the MMO for good measure... depending on your results, some use it in every tank no matter the fuel quality.
If your oil level goes down a half quart before reaching your next anticipated mileage for it to be changed, top off the oil with MMO and run another 500 ~ 1,000 miles, then change... by seeing when (if) the oil level went down, you'll have a better idea of when to change it in the future... and cleaning up the rings will sometimes decrease the oil consumption for future OCIs. I've got my little '96 Nissan truck on a 6 month interval of oil changes... every April or May and again in October or November as it never quite hits 5,000 miles in those six months being mostly short tripped and having a small oil pan to boot. Best of luck to ya...