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ok, so i had a turbo on my civic back when i though racing hondas was cool. before that i got around 40 mpg, with the turbo im not totally sure what it was, but it was like 32-35? MAYBE i cant remember, bottom line is, it was less. and this was set up as good as it could get for mpg (cuz im cheep) at first i had bigger 310 injectors and the entire time i was not running a secondary o2 sensor, as well as im pretty sure the boost blew my pcv valve out and i had no idea about it and i had onle a 4 inch down pipe and no exhaust. but then i put some stock integra injectors in. it was better. i had no tune and a small intercooler. about 5-7 psi of boost. MAYBE if you ran super tiny boost and got a real nice tune you could see an increase. but running stock injectors with boost is what killed my old engine. the only thing that is for sure about turbos is it will make your car faster. i was able to beat v8 mustangs lol. you might be able to get the same MPG as before but it will take tuning. its a very expensive way to get a gain in mpg though. dont take my word for it though, im not exactly the smartest person in the world. i just have a tiny bit of experience in that field.
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