blackstang2887

Hey guys, i just recently finished swapping out the v6 from my 95 for a 5.0 from a 94 and i am very happy with the results! can't wait to start modding! i just have one question, what would be wrong with the car to make it get like 12 mpg? cause thats what i got on my first tank. the engine is stock and has 90,000 miles on it.

tmajikman

Your heavy foot, j/k, not sure, hopefully somone will chime in.

luckythirteen13

i get 12-14mpg when i drive in the city. remember you have 2 more cylinders now

tmajikman

Lucky13, it looks like you get 5 mpg with the motor in your sig, sweet motor.

blackstang2887

haha yea i knew there would be a difference but i didn't think it would be that bad. heavy foot may be some of it but i wasn't that hard on it. o well i thought i'd clean the air filter and the maf and throttle body and see if that makes any difference.

blackstang2887

haha don't worry i won't forget!

AdderMk2

I get between 17mpg to 24... depending on how/where i drive

93 LX FiveO

what kind of ecu are u using?

o2 sensors, ect sensor, and other small sensors all tell the ecu how much fuel to use.

obviously a good tune-up could solve this too

start cheap and let us know

blackstang2887

i am using a stock 5.0 ecu, i got all my parts from one car, it was a 94 convertible that somebody smashed up. luckily everything mechanical was fine.

91stang

i used to get that kinda numbers but ever since i got a full exhaust (unequal shorties, o/r h pipe, and flowmaster catback) and my CAI i've been getting like 16-19 in city... plus mines stick