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Question

Asked: Oct 26, 2008 - 10:31 PM

Status: Closed

How come my gas mileage is so horrible?

I have a 96 mustange and it sat for about 7 months before i bought it. I changed the plugs, the air filter, the oil filter and the oil. I also put that stuff in the gas tank when you fill it up?? Cant remember what its called. I drive very regular, not gunning it at take off and have a stable speed. When I fill up (which takes about $50.00, I set the odometer and I get around 140 miles to the full tank! It is a 3.8 size engine. That is horrible!!! I think I have done everything I can? Also I have new tires and they are at the right level of air, so now what can it be? There has to be somthing else that I dont know. Please help me with an answer, thank you.

In Maintenance & Repair > Fuel Efficiency (MPG)
1 answer - 395 days ago

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Answers

karjunkie

Date: Oct 27, 2008
Time: 04:32 AM

I suspect you may have a clogged EGR and/or PCV valve. They are part of the emission control system that recirculates unburned gases to provide complete use of the fuel. The PCV valve is usually located in the valve cover and runs via rubber hose to the intake manifold. It is inexpensive and can be replaced very easily. The EGR valve is also connected to the intake manifold and can be removed and cleaned with throttle body spray cleaner. You may also need to run some fuel injector cleaner through a few tank fulls of gas to clean the fuel injectors as they will over time clog and provide poor gas mileage. I recommend you use Techron Concentrate which is the best brand in my opinion. One important thing to note going forward is always buy. Lastly, always use a tier one gasoline as it has additives to keep these parts clean. I only use Shell or Chevron as they have the best additives. Good luck!

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Why am I getting such horrible gas mileage?

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