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im sorry i dont have a solution for you, but i have a 90 s13 as well and i get the worst mpg in history, i did all that tune up stuff when i got it and just did a full synthetic oil change and stillnot seeing a difference, plus i only use 93 octane gas from the same place every time, still no improvment...
if any one has a good solution im all ears... or eyes as it were
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