2004_mustang_gt

I havea 2004 mustang gt rebuilt it has about 7000km's on it and it hardly get 250kms per tank, I think it can only handle about 50Litres, after calculating everything i think it gives about 12mpg, i only drive it city, could anything be wrong? thanks

Sxynerd

Hey way, How are you going to give all metric numbers then pull a MPG out of the hat.... You just tryin to confuse people? Anyway, the rebuild was done "about" 4,300 miles ago and your only getting 155 miles to a tank?

Other than that, to answer your question. Did you rebuild the motor with stock size rings?Increase the C:R? Proper break in? Have you gotten the car tuned? Is there anything wrong with your trans? How steep do you keep your foot into the pedal? What do your S plugs look like? O2 Sensor? A ton of things could be affecting mpg. If you haven't already do the basics, change the plugs, filter, and either get a AF mixture reader or get the car Dyno tuned and have the tuner readjust your fuel curve....

2000GT4.6

Assuming its a stock car it should be getting better than 12 MPG city, depending on how you drive it. The biggest differnce to be had in MPG is your right foot.

Sxynerd

Also, an engine will get better Gas milage as the engine is really broken in..... If there are no other problems it should increase in a couple of months...

2004_mustang_gt

I normally shift at 2000 or 2500 rpm nothing higher so, i dont really drive it hard.

2004_mustang_gt

I normally shift at 2000 or 2500 rpm nothing higher so, i dont really drive it hard, it is completely stock.

incubus1275

basicly, if you just start your car and drive it short distances like in the city, yes you probably will get 12 mpg. During warm up when the computer is on "open loop" you run very rich. The ratings for cars is at operating temperature which for a mustang is about 210 degrees. I have a 160 degree thermistat and i know thats ther reason i get poor milage. I think the reason you get poor milage is because you car is not getting fully warmed up and it never gets to running temperature often.

your computer runs rich until the engine temp reachs 165 degree and then if all is well and the computer is getting good readings it goes into "closed loop" and uses the 02 sensors. 02 sensors are completely useless until your car is warmed up!

Also, if you shift at 1800 rpm, you will be at maximum efficency. if you are on the highway, maximum fuel milage is at that rpm.

bransdaman78

no if the mpg is that bad somehting is wrong

incubus1275

guys, he does mosty city driving he says. there for I am asuming it is always shifting. 2500 is to high and its probably not getting warmed up