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Old Jan 25, 2011 | 03:49 PM
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Fuel Guzzler

I have a 99 f-150 XL sport (6 cyl, 4.2) It only has 68k on it and is in great shape. I drive mostly around town and I am averaging only 300 miles a tank. Why is that? Oil is changed every 5k, tires have good tread and inflated properly and engine is in great mechanical shape. I am not hard on the truck either. Could anyone please comment on what the issue is. I am just assuming I should take it in for a tune-up? Thanks, Dave
 
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Old Jan 25, 2011 | 04:30 PM
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You do not mention whether the CEL is on. It's possible that you have some codes stored, and the light doesn't work.

I hate to say it but, might be the time to have it put on a diagnostic computer, when it's stone cold (the truck), and monitor everything as it warms up. I had a '00 E-250 w/4.2, and I got around 16 mpg in general driving, 2-3 less at warp speed.

Dave
 
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Old Jan 25, 2011 | 04:34 PM
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Fuel Guzzler

I am not sure what you mean by "CEL" or a light that is on?
 
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Old Jan 25, 2011 | 05:01 PM
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Check Engine Light

Dave
 
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Old Jan 25, 2011 | 05:08 PM
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Pretty low miles for a 12 year old truck, and that's not always a good thing. Vehicles that sit around a lot tend to have more issues with corrosion, seized parts, hard/cracked rubber lines/seals.

For instance you are pretty used to the truck, and minor issues, over a period of time might not raise any red flags. However, added all together, could easily cost you 3-4 mpg.

Dave
 
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Old Jan 25, 2011 | 05:16 PM
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Fuel Guzzler

Ok, thanks for the info. I guess I will have my mechanic look over it soon to check for those possible bad parts.
 
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Old Jan 25, 2011 | 05:43 PM
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300 miles to a tank means nothing, what is the actual mileage?
 
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Old Jan 25, 2011 | 05:57 PM
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Fuel Guzzler

68k, 21 gal tank
 
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Old Jan 25, 2011 | 06:10 PM
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Originally Posted by DMosser
68k, 21 gal tank

That's not what galaxie is talking about.

You need to fill up your tank (don't top it off). Get in and reset the trip meter. Drive it as you normally do. When tank is near empty, fill it up again. Take your current trip mileage and divide it by how much gas you used.

Do this over a few tanks and you should get a fairly accurate fuel economy reading for your truck. Reason being is you may be getting 300 miles to the tank, but there could be 4 gallons left, and the gauge is slightly off, or there could be 2.1 gallons in there, there could be anything, so you have to calculate the actual mileage unless you're actually using ALL the gas in the tank to get the readings.


With that said, come back in a few weeks and let us know the mileage over the period of a few tanks.
 
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Old Jan 25, 2011 | 06:23 PM
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I understand. Should I wait for my gas light to come on? I always reset my trip meter when I fill up and usually average 340 mi/tank. All of the sudden I had to fill up before I got to 300.
 
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Old Jan 25, 2011 | 07:08 PM
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I have the same truck, except w/4.6, and the fuel tank is 25 gal., and when the low fuel light comes on, if I stop right away to fill up, I have 2.5 in the tank ( 22.5 gal to fill it up again ). If his figures for miles per tank are pretty close, he's a little over 13 mpg. Not that great for an empty ( payload ) truck.

Dave
 
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Old Jan 25, 2011 | 08:01 PM
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other

Ok, so just to clarify Dave.......I am not getting good gas mileage and I should have it checked out?

Another question for the expert: I have very squeaky brakes and they are only a few months old. They are some type of ultra quiet titanium or platinum something. I am willing to bet that all I needed was Ford's recommended Motorcraft pads. What do you think?
 
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Old Jan 25, 2011 | 10:34 PM
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I guess that's where you are at, regarding any further ideas on your mpg. I think you would notice anything really causing problems.

I'd hook up the truck to a diagnostic computer. Checking everything from cold start to fully warm. Simple/cheap stuff that can rob gas are vacuum leaks, partially plugged air filter, 2 sensors located in the air cleaner duct work ( just clean them), plugs/plug wires ( although based on mileage they are probably good, based on years though, at least the wires may be an issue), see how long it takes to reach fully warm ( faulty thermostat will prolong warm up) . Most of all have him (her) check for any stored code in the trucks computer.

As for your brakes, most of the premium pads/shoes are a longer wearing type, and are great for hard use, like towing, lots of stop and go type driving. The linings are quite hard, and do not fade much at all if/when they get heavy use. They do however tend to squeak or squeal more. Not really a problem as much as a trade off for longer/better braking.

Dave
 
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