replaced injectors..

Quick question fellow sfldriftians.... I replaced my injectors to my 92 240sx and it runs great, but I feel like my MPG got worse... i feel like im putting gas into it like everyday now... fml... any ideas?? thx

EDIT: BTW this probably makes a difference in the question... I got the injectors off a 1999 Nissan Ultima at the junkyard
 
lower injector o-ring maybe leaking if u didnt put new ones then u ma have an issue
 
240's arent meant to be economical. the best mpg i ever got was 25 highway 17 city. my dads 97 f150 got better mpg than that
 
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lol ya elliot... just want better Mpg then wat I have now... and 240s are NOT shitboxs..... miatas are for bitches
 
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