| | Severe drop in mpg |  |
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eignub
Posts : 127
Join date : 2008-11-16
Age : 35
Location : Tucson, AZ
|  Subject: Severe drop in mpg  Sat Feb 07, 2009 12:29 am | |
| ok, so over the last year i had been consistently getting about 16-17 mpg. then about mid fall, it started going down to just around 16. And has continued going down until with todays fillup i only got like 13 mpg!!! what could cause such a massive drop in economy? i havent changed anything outside of regular maintenences. by the way, i am running the i6 200. thanks for any help you guys can offer. | |
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bigblockcowboy
Posts : 154
Join date : 2008-11-11
Age : 48
Location : Hinton, Alberta, Canada
| | Subject: Re: Severe drop in mpg Sat Feb 07, 2009 1:10 am | |
| You still runnin a cat and the smog shite? That'd do it, especially if your cat is getting clogged | |
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Stymees'mont
Posts : 406
Join date : 2008-11-08
Age : 51
Location : Minnesota
| | Subject: Re: Severe drop in mpg Sat Feb 07, 2009 4:33 pm | |
| I also believe our fuel is not as good as it once was.......way to much ethenol. I bought so unleaded fuel for my truck with NO ETHIENOL and my mpg came back with it...problem is it is more money........#$%^#%& ethenol !!!! | |
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rancheronut
Posts : 26
Join date : 2009-01-28
Age : 58
Location : MT WHERE ELSE?
| | Subject: Re: Severe drop in mpg Sat Feb 07, 2009 6:19 pm | |
| maybe ,here something you would also check. your vacum advance to make sure it still working completely. i had one on my 73 ford f350 crew cab truck go bad like that. it started at 15mpg, was down to 8mpg in over 5 tanks of gas. truck ran fine the hole time. after check every thing over(carb/compression/exhaust/timing at idle). put in on a dyno and found vacum advance only had 5 degree. replace it and MPG went back to 15. | |
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Futurama
Posts : 376
Join date : 2008-11-12
Age : 44
Location : ft worth texas.
| | Subject: Re: Severe drop in mpg Sat Feb 07, 2009 6:28 pm | |
| check you plus and wires, one of them may be fouled and the timing isnt right. | |
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eignub
Posts : 127
Join date : 2008-11-16
Age : 35
Location : Tucson, AZ
| | Subject: Re: Severe drop in mpg Mon Feb 09, 2009 7:05 am | |
| i'll check the vacuum advance, plugs, and wires on my next day off. i've been trying to drive it more to try to notice any difference in running, and i noticed that sometimes if i put it under load, then let off the gas, then go back on it, it seems to stumble a bit, more often when cold. | |
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Futurama
Posts : 376
Join date : 2008-11-12
Age : 44
Location : ft worth texas.
| | Subject: Re: Severe drop in mpg Tue Feb 10, 2009 12:37 am | |
| sounds like the advance to me. | |
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eignub
Posts : 127
Join date : 2008-11-16
Age : 35
Location : Tucson, AZ
| | Subject: Re: Severe drop in mpg Sat Feb 14, 2009 1:53 am | |
| well, i hope this helps  old advance - new advance i will let you all know if it helps my mileage or not. i'm also going to be checking the plugs for buildup on my next day off. | |
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