Alright, I know there has been alot said about gas mileage for Mustang II, but I have been realizing something that isn't right. At least I think. Well I got this nice mustang II cobra about a week ago. And it runs good, but the gas mileage is horrible. I don't know what it is, but I was out tonight drove on a 20-25 min drive about I think 10 miles give or take a little and it took 1/4 a tank. Yeah I know V8's suck gas and these cars have smaller gas tanks I think it cost around $25-$30 dollars to fill it up. And I'm used to a little 4 cylinder, but that can't be right can it. Thats insane, it is suped to about 350 hp thats what the guy said with a 4 barrel edelbrock 650 cfm. Thats driving at at 55 mph with the rpm at about 2800. I was thinking that the clutch was going out because it kind of suffered a little in performance, but I'm starting to think that its something with the engine maybe it's running to rich or something. Some examples are when I take off in first it kind of hick upes and stumbles a little bit almost dying and I notice that when I'm driving it kind of stutters alittle bit. The first day I had it, it seemed like it drove better a lot easier to roast the tires, but now all i can get is a good squeel. WELL LET ME HEAR YOUR IDEAS(this car has been sitting for 2 years!)NEED HELP THANKS!
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- Thread starter admaster99
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The classic "car runs great til ya get it home".. check all the usual see if it is running rich the condition of the spark plugs.. maybe your plugs are bad .. check plug wires ( they do corrode, i know ) any black smoke or anything.. ? if your burning oil it might take more gas to combust and that would cause bad gas mileage ? ..low tire pressure 
... just check around man... or maybe thats just what your gonna have to deal with! ...
wrong fuel sending unit? incorrect gas tank? gas leak? brakes hung up? emergency brake on? emergency brake cable hung up? 
admaster99 said:
Basing fuel economy on indicated usage is insane. Fill it up on a level surface, run it till it's almost empty, then refill at the same place.
Only then can you get a determination of actual usage.
Mine stays over full a LONG time, but the needle dropping on the last quarter is like an anvil out a window.
Might check the hose between the aux and main tanks for condition, also the aux tanks are pretty famous for leaking.
jeffnoel
Founding Member
If it's a V8 car it was standard equipment. It's mounted in the drivers side rear wheelwell behind a removable metal plate.TRIT0N said:
THE COBRAMAN said:
agreed not a very accurate way to measure actually usage
think about how many times you roasted the tires stop and start
go on a long drive on the interstate
Lets do the math
15 gallon tank ---- 15/4 =3 3/4 gallons per quarter 3.75 x 8 MPG = 30
not overly excessive in my book. If you were doing a few burn outs and a gear jammin session along the road.
ps the shape of the II tank has a section that rises up and is above the sender in addition the the reserve tank in the fender
As cobraman said first half is like 2/3 tank and the second half is the last 5 gallons it goes quick
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