help MPG issues
Logistics Pro
Joined: Jan 2002
Posts: 4,907
Likes: 39
From: suburban atlanta
Unless you are driving 80 mph all the time, it is likely a malfunction. You may be able to fix it if you can figure out what is the cause. I would check 1)air filter, 2)fuel pressure 3)static fuel pressure & leakdown, 4)thermostat opening temp & operating temp. A few other sensors may affect mileage also, such as the coolant temp sensor and air temp sensor.
I don't know how you are calculating your mileage, but you have to have an accurate odometer to get accurate measurements, and you have to measure the fuel over several fills to average the consumption as the gauge is not accurate enough to use for mpg calculations.
tom
Added: Check the accuracy of your odometer by using the mile posts on the side of freeways. I had thought them to be placed properly, but I would use several mile markers and compare the odometer reading to the miles traveled markers.
tom
I don't know how you are calculating your mileage, but you have to have an accurate odometer to get accurate measurements, and you have to measure the fuel over several fills to average the consumption as the gauge is not accurate enough to use for mpg calculations.
tom
Added: Check the accuracy of your odometer by using the mile posts on the side of freeways. I had thought them to be placed properly, but I would use several mile markers and compare the odometer reading to the miles traveled markers.
tom
Last edited by tomw; Oct 17, 2012 at 09:13 AM. Reason: add
Elder User
Joined: Nov 2003
Posts: 544
Likes: 0
One of the above answers should solve your problem, but I have seen where a very slow leak in your gas tank or gas line could cause poor mileage obviously. Depending on how much you drive and the time between fill ups, I wouldn't rule this out... You say you would smell the gas, yea sometimes, but if the leak is small enough, you may not smell the gas or just overlook it.
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