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no ammount of mods can help if you dont adjust the loose nut behind the wheel like these guys said.. if you do mostly city driving then i would say your not doing too bad.
when it comes to your cat delete, there is no 2nd o2 sensor on a 93 so that shouldnt cause a problem but the lack of back pressure might be hurting you a little bit.
if you are or have adjusted the loose nut already then i would look more into possible sensor issues that may not be setting off your check engine light but may be hurting your economy. on that pre-obd2 system you could have an air temp sensor off causing it to richen the fuel mix by giving the comp a faulse reading..but dont go throwing parts at it untill you are sure, the best way is to get a scan tool or find someone who has one to plug in and read the data stream and check things like temp sensors to actual temp and if one is reading way off then i would say its a safe bet then to throw 10 or 20 bucks into it. also i had a 88 tercel and mine had bad rings and burned a lot of oil so make sure you have good compression and that kind of thing...
good luck and dont give up. keep workin on driving habbits and keep puttering with the mechanical stuff untill you get it right
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