5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

I need fuel advice now!!!!!

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Old 04-19-2008, 09:49 PM
  #1  
5.0 85 GT
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Default I need fuel advice now!!!!!

OK, so i have my good old 94 gt which i love..but heres somehtign i do not love...my gas mileage

I no everyone complains about it but u complainers are getting 250-300 to the tank, i am getting 120 to the tank.!

Does a Cold air intake, a little elss than mild cam, catted x and catback and a chip really take away my MPG's??? It costs almost $50 bucks to fill the tank with REGULAR whcih is 87 Octane and i get 20-25 miles ot a quarter tank...

Are there any valves sensors somehitgn i can clean or fix to up my mileage???? it has a fairly new distributor and mallory plugs n wires..shjould i see fi they are gapped correctly?? my tires are up to pressure as well so idk what is killing me, i launch very easily, take off from second gear soemtimes, use neutral down hills and adjusted my idle very low so when i go into neutral is like its not even running....tell me somethign.!!!!!!!!!!!!!!!!!!!!!!!!!!!!! please!!!!!
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Old 04-20-2008, 12:00 AM
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nitrous_bob
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Default RE: I need fuel advice now!!!!!

starting in 2nd is not fuel efficient, what gears do you have ? is the speedo corrected ?

how are you figuring out your mpg ??? the only proper way to do it is to topoff w/ gas, reset your odo, and then drive for about 100 miles or the whole tank either way. then topoff again and use those miles, against those gallons.

i have 4.10's and get 21 mpg on my tired 146k motor
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Old 04-20-2008, 01:04 AM
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Boosted5.slow
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Default RE: I need fuel advice now!!!!!

Fresh tune up,backing off timing, Theres quite abit you can do.

heres a website on mpg hopefully it helps

http://www.fordf150.net/howto/fueleconomy.php
http://www.fueleconomy.gov/FEG/drive.shtml
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Old 04-20-2008, 11:36 AM
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5.0 85 GT
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Default RE: I need fuel advice now!!!!!

ok thansk for the help, and i have 3:08 rear gear everythign is correct the speedo etc...and i fill up a lil past full reset my odometer, drive till half a tank, ill get maybe 80 miles if that to half a tank, then assume i get another 80 to the second half, so 160 ish to a tank, or ill fill up again and use the miles against the gallons, it is horrible on gas..she is good not he highway but around town i jsut die, and i guess i wont be using second gear out the hoel then..
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Old 04-20-2008, 11:51 AM
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mjr46
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Default RE: I need fuel advice now!!!!!

try cleaning the maf if you have a k&n type oil filter....oil residue can contaminte maf a skew readings and in turn affect fuel mpg's
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Old 04-20-2008, 01:32 PM
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nitrous_bob
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Default RE: I need fuel advice now!!!!!

ORIGINAL: 5.0 85 GT

she is good on the highway but around town i jsut die
well if your talking city driving....yeah hard to get 12 mpg really, as long as your getting 22-24 on the all hiway miles...you got what you got
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Old 04-20-2008, 02:27 PM
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fordboyyfm
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Default RE: I need fuel advice now!!!!!

im sure te chip isnt helping, they always claim better fuel milage but i never beleive it.
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Old 04-20-2008, 04:29 PM
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302army187
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Default RE: I need fuel advice now!!!!!

make sure your o2's are good also, i would check/clean/replace all sensors.....
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Old 04-21-2008, 08:56 PM
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5.0 85 GT
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Default RE: I need fuel advice now!!!!!

yea thanks i just did my x pipe and got 2 new 02 sensors..so i am good there, ill try cleanin the maf
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