less than desired mpg...
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Elder User
Joined: Jun 2010
Posts: 568
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From: Northern IL
less than desired mpg...
Only recently has my mileage dropped. It's been consistently giving me 10mpg city 13 highway. I did a tune up a month ago, no codes and it runs smooth. The only thing I can think of is the air pump sounds like it has rocks for bearings. I've been meaning to get that changed out but I haven't save up the funds to do so. Could this be my culprit?
Elder User
Joined: Nov 2009
Posts: 890
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Only recently has my mileage dropped. It's been consistently giving me 10mpg city 13 highway. I did a tune up a month ago, no codes and it runs smooth. The only thing I can think of is the air pump sounds like it has rocks for bearings. I've been meaning to get that changed out but I haven't save up the funds to do so. Could this be my culprit?
Laughing Gas
Joined: Jun 2005
Posts: 820
Likes: 11
If you live in the north you're getting winter gas by now. That always makes a hit in MPGs for everybody. Also, if you were using straight gas and then started using an Ethanol blend, 5-15%, then you'll definitely notice a drop off on mileage. If you did both, then it would seem like something really is wrong (and there is but not with your truck).
Laughing Gas
Joined: Jun 2005
Posts: 820
Likes: 11
There's your problem. There's not much you can do about the winter blend if you're not willing to move to the south but if you can find a local station that sells non-ethanol fuel you can maybe get back .5-1.5 MPGs
Oh, as long as the air pump isn't completely locked up or has extreme drag it shouldn't put too much load on the engine. Any way you'll want to get it fix. If the bearings are bad it's only a matter of time before it fails and that would be a problem.
Oh, as long as the air pump isn't completely locked up or has extreme drag it shouldn't put too much load on the engine. Any way you'll want to get it fix. If the bearings are bad it's only a matter of time before it fails and that would be a problem.
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Elder User
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From: Northern IL
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Laughing Gas
Joined: Jun 2005
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Don't know. I haven't had to change one out. Every time I've had one go bad I just pull it and toss it in the trash. I can't imagine that it would be any more difficult that changing an alternator or power steering pump pulley. You may need some special tools but any chain parts store should have them.
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Hotshot
Joined: Jul 2002
Posts: 14,285
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From: Bend,OR
i would start scrounging around the wrecking yards for a replacement smog pump now. if that thing locks up you will loose a belt and probably not in a good place.
the winter blends suck and for sure reduce mileage agood 1-2mpg.
the winter blends suck and for sure reduce mileage agood 1-2mpg.
Tuned
Joined: Apr 2011
Posts: 464
Likes: 5
From: Redmond, WA USA
Out here in Pugetopolis, in the People's Republic of Washington, the winter gas formulation usually causes my fuel mileage to drop between 5-10%. We have up to 10% alcohol year-round, except at a few "pure-gas" stations (you can look them up here: Ethanol-free gas stations in the U.S. and Canada).
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