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Recent gas mileage

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AC7060IL View Drop Down
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Joined: 19 Aug 2012
Location: central IL
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AC7060IL Quote  Post ReplyReply Direct Link To This Post Topic: Recent gas mileage
    Posted: 27 Jan 2021 at 11:03pm
I keep mileage records for all our well maintained vehicles. In the last 2 months (December2020/January2021), I’ve noticed a consistent 10-15% decrease in mileage using regular gasoline. Anyone else noticed a similar trend? If so, then I wonder if this drop in mileage is due to stale gas? poor quality gas?


Edited by AC7060IL - 27 Jan 2021 at 11:04pm
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Dakota Dave View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dakota Dave Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 12:48am
I get the same drop every year when we switch to winter fuel. This winter I'm driving my 454 powered suburban my mileage dropped from 10 to 8. I just got my lumina van back together.
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ac45dave View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ac45dave Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 1:56am
Originally posted by AC7060IL AC7060IL wrote:

I keep mileage records for all our well maintained vehicles. In the last 2 months (December2020/January2021), I’ve noticed a consistent 10-15% decrease in mileage using regular gasoline. Anyone else noticed a similar trend? If so, then I wonder if this drop in mileage is due to stale gas? poor quality gas?
I've dealt with this complaint for years in the automotive business.You have to remember cold air is more dense and has more oxygen which causes the fuel control system to ramp up the fuel delivery to keep the fuel air ratio maintained at 14.7:1 which is required for catalytic converter operation.Winter blend fuel also contributes to the cold weather mileage loss.I loose 2-3 mpg during cold weather depending on how cold it gets.It's a normal deal.
54 wd-45gas ; 56 wd-45d N/F w/fact p/s ; 63 d-17 sIII N/F gas ; 60 D14 N/F ; 67 d-17 sIV N/F gas ; 63D15 sII W/F; 39rc#667 ; 2021 massey 4710 fwa ; gravely 2 wheel tractors
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Tbone95 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tbone95 Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 7:14am
As said above, UNLESS, this is a year over year comparison???
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jaybmiller View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 7:16am
When it's cold I let my truck idle for 10 minutes(auto-remote-start default). That does reduce MPG BUT a warm engine and tranny last longer !!

BTW if we got 100MPG, the gas companies would be outta business.. or gas would cost $10 / gallon......

I'm 1/2 way there this mornig.. $4.50  USD/USG..up 50c overnight....hmmmmm
dang COLD here today...hmmmmmmmmmmmmmmmmmmmmm


Edited by jaybmiller - 28 Jan 2021 at 7:17am
3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)

Never burn your bridges, unless you can walk on water
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AC7060IL View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AC7060IL Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 8:21am
ac45dave, Thanks for sharing your auto knowledge. I went back a few years to check old mileage records & sure enough the colder months produced a few similar lower mpg. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jiminnd Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 8:40am
Like many said, winter gas and here in ND we warm up cars, don't get good mileage when just idling.  My car drops from 19-20 to 16-17 mpg.
1945 C, 1949 WF and WD, 1981 185, 1982 8030, unknown D14(nonrunner)
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Clay View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Clay Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 11:57am
Mileage on my Toyota Camry has been dropping off.  
Found out yesterday why.....
The front right caliper was not releasing completely.  Dragging the brake.
Left side pads were like new but the right side was metal on metal.
New pads, rotors and calipers.
Bet my mileage jumps three or four MPG.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote klinemar Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 3:13pm
I put a new set of General Grabber tires on my 2018 Ram 2500 and my mileage went down between 2 and 4 mpg. Then my dearly beloved reminded me we are on winter fuel and you have been using your remote starter more. I have to admit she's right! Also sitting in line idling at the bank as all you can use is drive thru!
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john(MI) View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote john(MI) Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 5:07pm
They used to say that when they went to summer fuel it cost more to produce due the extra chemicals required.  At that time it was supposed to cost $.25 per gallon.  I don't ever remember the price decreasing when cold weather set in!  Those chemicals must cost upward on a dollar now a days!!!
D14, D17, 5020, 612H, CASE 446
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Amos View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Amos Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 5:39pm
A bit off the topic, but I think related, I have been having a hard time getting fuel to  not go stale in a couple weeks from putting it in a can.  Having trouble with both my saws and my model plane engines, after a couple weeks it starts to make them run uneven and stall at idle, and ping at high rpm, and I only use premium in them...  started about the end of may this year.  If the quality isn't there then I am sure the mileage will be off...
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weiner View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote weiner Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 7:16pm
I just thought that today when I filled up from a 200 mile road trip where I always got a good solid 35,  but today it was just over 25.
Real heros wear dogtags, not capes.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 7:49pm
hay amos.... possible reason...
According to Dan McTeague, a noted petroleum analyst, Shell and Esso 91 are both ethanol free. All other grades from the companies have some ethanol content, but the mid-grade blend is pure gas, which means it not only corrodes less than ethanol blends, but is less likely to deteriorate when stored.

The airplane fuel from Skycraft Hobbies used to be GREAT... knew the original owner years ago...
3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)

Never burn your bridges, unless you can walk on water
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Dakota Dave View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dakota Dave Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 9:08pm
I have to run 100 LL in my airplanes. Fortunately it has a long shelf life.
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shameless dude View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shameless dude Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 10:32pm
the water in the gas is freezing? 
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HD6GTOM View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote HD6GTOM Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jan 2021 at 12:04am
On a 300 mile trip today mine went from 20.5 measured mpg to 18.1. I'll probably take the pickup tomorrow.
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