I used to own a 90s 1.9L sohc auto trans as well. Mostly stock it would do around 50mpg @ 45mph, and 43mpg @ 55 mph according to a scangauge
https://ecomodder.com/forum/showthre...tml#post327783
That car was rated 33 hwy, the tracer appears to be rated 31hwy, so I’m guessing in stock form you could pull roughly 40mpg @ 55mph. Looking like you’ll need a 50% improvement over stock to hit your original goal. 50mpg @ 50mph might be a good first goal