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If you are at least getting somewhere near 20mpg then you should be fine. It's probably not the o2 sensor because it would most likely be running like crap(in safe mode) if you needed a new one. My '95 only got 15mpg. Did you notice a decrease in mpg lately? When was the last time you changed your plugs and wires? I would tell your bro to can-it with the mpg crap, his might get more but if say ya'll spent the same amount of money on mods yours would turn out way faster. What's more important power or mpg?
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05 Srt4
Agp 3147 w/supporting mods
97 Mx-5
T28, hks man, ebay int/pipes, rfl bov, xtd 6 puck, 3" magnaflow, msd timing box,
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