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Fuel mileage issue

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Old 06-21-2012, 11:18 AM   #1
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Fuel mileage issue

Hey guys I have another question for you. For some reason this past full up my fuel mileage dropped from roughly around 22 mpg to about 14-15 mpg. It's an 03 prerunner with a 3.4 any ideas?
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Old 06-21-2012, 11:59 AM   #2
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Could be that you drove more aggressively, poor gas, or bad 02 sensor, but there are so many reasions for it.

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Old 06-21-2012, 12:56 PM   #3
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Heh, just ONE fillup?

I will say this: usually the simplest explanation is the correct one. Last time you didnt fill it up all the way.
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Old 06-21-2012, 02:31 PM   #4
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The difference was in one fillup. I filled up my tank drove home and noticed right off the bat that my gauge dropped further than usual and I always reset my trip odometer when I fill up just invade something like this happens. I wasn't driving aggressive and infact I noticed after today when I had to get on it a bit it started getter gas mileage again. Now I'm think maybe a fuel filter or something. Any thoughts? I'll post what's find out just invade this happens to anyone else
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Old 06-21-2012, 03:05 PM   #5
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Proper tire inflation?
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Old 06-22-2012, 06:05 AM   #6
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Quote:
Originally Posted by Schenko View Post
The difference was in one fillup. I filled up my tank drove home and noticed right off the bat that my gauge dropped further than usual and I always reset my trip odometer when I fill up just invade something like this happens. I wasn't driving aggressive and infact I noticed after today when I had to get on it a bit it started getter gas mileage again. Now I'm think maybe a fuel filter or something. Any thoughts? I'll post what's find out just invade this happens to anyone else
It is now *conclusive*. You definitely need to pay more attention when filling the tank. Sometimes the handle will shut off before the tank is full. YOUR TANK WAS NOT FULL!!!!
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Old 06-22-2012, 06:16 AM   #7
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I have a second gen and live in Ne, but I just completed some personal research on the local fuel. We have ethynol fuel here and using 91 octane with no ethynol outside of Omaha from shell, I can get 22.5 MPG using 89 with ethynol I get about 15 MPG. 87 without ethynol 19 MPG and 91 which dosen't say it has ethynol (which I don't believe because I am in Nebraska) still gets around 15 16 MPG. So a long story short it may simply be the quality of gas for that single tank. I was amazed to see my milage go from 22.5 MPG to 15 MPG in just one tank. The Gas station makes the difference, but I wouldn't be concerned from one tank if the poor mileage is not consistant. Time will tell.
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Old 06-22-2012, 06:28 AM   #8
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Ethanol additive in the fuel will do it too
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Old 06-22-2012, 07:06 AM   #9
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I don't think ethanol would kill your mileage over 30%. I think we have 10% ethanol in our gas here in California and I get around 22 on the highway in my V6 4x4.

The assertion that your tank was not completely full on the last fillup makes the most sense to me.
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Old 06-22-2012, 11:14 AM   #10
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[QUOTE=PolishAndWax.com;5276797]I don't think ethanol would kill your mileage over 30%. I think we have 10% ethanol in our gas here in California and I get around 22 on the highway in my V6 4x4.
QUOTE]

The Ethanol gas here is clearly labled "10% Ethanol Enriched" on 89 and now 91 Octane. The 87 Octane is not enriched and is more expensive than the 89 Octane and only slightly less than the 91 but still gives better MPG than the 91. Here it is very obviouse and hard to find a gas station without ethanol. Any gas outside this state is more efficiant so far. My fuelly results show the history and even subtle off roading and mountain driving in Co got better gas milage than normal driving with ethanol. Differnet gas stations vary in efficiancy too due to the different additives they put in the fuel. A sungle spike in lower efficiancy with a confident thought of not missing a fuel up leads to less quality gas.
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Old 06-22-2012, 01:06 PM   #11
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If the only thing the OP noticed was MPG, I doubt it was the fuel.

Again, we're talking about a hit of over 30% in MPG. That's almost how much of a hit I take when I tow my boat. If the fuel was that low in energy, IMHO he would have noticed a difference in the way it drove.
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Old 06-22-2012, 01:46 PM   #12
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Well I have flucuated from 15.1 - 22.6 and the only difference was the fuel, so you wont really know what the issue is until you get historical data. If the problem is consistant, it may be the truck.
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Old 06-24-2012, 02:10 PM   #13
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well my tank is almost done and im about to fill up again. i had poor fuel mileage the entire tank. also im positive i had a full tank from the beginning. i also noticed a lack in power. im right at the time to do an oil change and also change my air filter. im going to try to run sun fuel injector cleaner through. i just did a tune up a few months ago so i doubt its an ignition issue. im going to change the fuel filter as well and see what happens. first im gonna verify its not the gas by filling up again and see if it does it still.
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Old 06-24-2012, 02:11 PM   #14
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Quote:
Originally Posted by Schenko View Post
well my tank is almost done and im about to fill up again. i had poor fuel mileage the entire tank. also im positive i had a full tank from the beginning. i also noticed a lack in power. im right at the time to do an oil change and also change my air filter. im going to try to run sun fuel injector cleaner through. i just did a tune up a few months ago so i doubt its an ignition issue. im going to change the fuel filter as well and see what happens. first im gonna verify its not the gas by filling up again and see if it does it still.
You're filling up at different gas stations, right?
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