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#4417516 - 05/29/17 07:27 PM Better MPG with age and miles
otis24 Offline


Registered: 10/30/05
Posts: 1656
Loc: South Dakota
My in-laws gave my daughter their 1996 Mercury Villager, 3.0 V6. They purchased it when it was about a year old and around 30k miles. Currently, it has 237k miles. Prior to the 100k mile mark, they averaged 20-21 MPG. Afterwards, it is getting 27-29 MPG. Not sure why. I drove the vehicle from their house in SE Colorado to my home in South Dakota. Still runs and drives great. Inside is pretty immaculate. My Father-in-law was always a Ford man since his early teens. Now 72, he recently purchased a Nissan Rogue. Convinced only because his Villager was a rebadged Nissan.
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1991 Chevrolet K1500 (4.3, 4x4, 86k miles)

2016 Dodge Grand Caravan
(3.6 V6) 46500 miles

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#4417528 - 05/29/17 07:34 PM Re: Better MPG with age and miles [Re: otis24]
spasm3 Offline


Registered: 05/30/10
Posts: 8662
Loc: North Carolina
I've seen a few cars get better mileage after say 10k. I've seen some high mileage cars start getting a couple of mpg better as the coolant level goes down, right before a head gasket lets go. My sons saturn got phenomenal fuel mileage( 3mpg over most sc1 manuals), and a really worn cam lobe was found on teardown.

I am having trouble with the 8 mpg increase you describe, nothing about that makes sense. Thats a huge increase. Are the tires stock? Smaller tires would throw off the odometer and your mpg calculations.
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#4417537 - 05/29/17 07:45 PM Re: Better MPG with age and miles [Re: otis24]
Nick1994 Offline


Registered: 02/19/13
Posts: 10123
Loc: Phoenix, AZ
It depends on how it's driven. They might have short tripped it while it now sees higher speeds and longer distances.

The mpg display on my grandparent's Trailblazer sometimes says <12 mpg, because sometimes all it sees is 2 mile trips to the grocery store and back. But if I were to drive it I would probably get high teens in it since I drive 70+ miles everyday, lots of highway.
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#4417538 - 05/29/17 07:46 PM Re: Better MPG with age and miles [Re: otis24]
otis24 Offline


Registered: 10/30/05
Posts: 1656
Loc: South Dakota
Stock tire size. I will go to fueleconomy.gov and see what this vehicle is rated at. But I filled the tank and tracked the mileage myself.


Edited by otis24 (05/29/17 07:46 PM)
_________________________
1991 Chevrolet K1500 (4.3, 4x4, 86k miles)

2016 Dodge Grand Caravan
(3.6 V6) 46500 miles

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#4417552 - 05/29/17 07:56 PM Re: Better MPG with age and miles [Re: otis24]
andyd Offline


Registered: 09/25/04
Posts: 7158
Loc: Marshfield , MA
Are you using e0 vs e 10?
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#4417558 - 05/29/17 07:59 PM Re: Better MPG with age and miles [Re: otis24]
AZjeff Offline


Registered: 01/14/11
Posts: 2650
Loc: PV Az
So they averaged 20-21 and you got 27-29 on a long distance xc trip going east? Sounds normal.
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#4417689 - 05/29/17 10:11 PM Re: Better MPG with age and miles [Re: otis24]
Linctex Online   content


Registered: 12/31/16
Posts: 6156
Loc: Waco, TX
Maybe it's so loose, internal engine friction is nearing zero grin
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#4417698 - 05/29/17 10:32 PM Re: Better MPG with age and miles [Re: otis24]
otis24 Offline


Registered: 10/30/05
Posts: 1656
Loc: South Dakota
20-21 was their average over a very long time and different driving conditions. They have owned this vehicle for twenty years. The long distance driving was one trip by me under varied and sometimes hilly terrain. They kept the vehicle so long because it was getting such good MPG. They were well aware of the changes in MPG, it wasn't just me who experienced it.
_________________________
1991 Chevrolet K1500 (4.3, 4x4, 86k miles)

2016 Dodge Grand Caravan
(3.6 V6) 46500 miles

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#4417702 - 05/29/17 10:55 PM Re: Better MPG with age and miles [Re: otis24]
Ducked Offline


Registered: 10/25/12
Posts: 4384
Loc: Taiwan
I get better mileage as I get older, because I don't drive so fast.

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#4417763 - 05/30/17 03:13 AM Re: Better MPG with age and miles [Re: Ducked]
3800Series Offline


Registered: 08/02/14
Posts: 1452
Loc: Gulf Coast, MS
Originally Posted By: Ducked
I get better mileage as I get older, because I don't drive so fast.


This, also it's not horribly uncommon for something in a car to go bad and it increase gas mileage. There is always a side effect but a lazy o2 or even a old TPS can go bad and tell the car its going slower then it is resulting in slightly less amount of fuel being used.

Eight mile per gallon extra is rather high. I took our old 95 Regal to Iowa a couple of weeks ago. Car averaged 31.5 miles per gallon vs its normal 27 highway. I think a lot of this had to do with the car already being warmed up after it ran for an extended period of time more then anything else tho.


Edited by 3800Series (05/30/17 03:16 AM)

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#4417786 - 05/30/17 05:33 AM Re: Better MPG with age and miles [Re: otis24]
L_Sludger Offline


Registered: 10/04/09
Posts: 3947
Loc: Ohio
It has the most to do with the nut behind the steering wheel, and driving habits. Then maintenance including tire pressure.
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#4417874 - 05/30/17 08:26 AM Re: Better MPG with age and miles [Re: otis24]
SHOZ Offline


Registered: 06/28/03
Posts: 5750
Loc: Illinois
My '08 Accent keeps getting better gas mileage as the miles rack up. Maybe at 155k miles it's broke in finally?

Currently getting 41 mpg and the oil consumption too has nearly stopped from a quart every 5k to no need to add at 5k miles. EPA estimated average is 29/32 mpg.

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2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual

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#4417967 - 05/30/17 10:16 AM Re: Better MPG with age and miles [Re: otis24]
BrocLuno Offline


Registered: 09/06/15
Posts: 5526
Loc: Kalifornia Kollective
Tail wind going east laugh
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#4418013 - 05/30/17 11:03 AM Re: Better MPG with age and miles [Re: andyd]
jeepman3071 Online   content


Registered: 04/15/10
Posts: 4220
Loc: Storrs, Connecticut
Originally Posted By: andyd
Are you using e0 vs e 10?


This.

I've found e0 vs e10 makes a big difference, especially with older vehicles that were designed before e10 was a major factor. My Jeep gets 16 mpg combined average with e10 fuel. The few times I filled up with e0 gas, I averaged a solid 18-19mpg doing the same kind of driving. Ethanol has less energy potential per gallon than pure gasoline does.
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2009 BMW 328i (32k) - Castrol Edge Euro 0w40, MANN HU816X

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#4418277 - 05/30/17 04:48 PM Re: Better MPG with age and miles [Re: otis24]
fdcg27 Offline


Registered: 09/25/09
Posts: 15718
Loc: OH
FWIW, I posted a thread with this very topic years ago.
I do think that fuel economy continues to improve with miles in a well maintained, mechanically sound engine.
I've seen this with various cars we've driven north of 150K.
I suspect that wear reduced ring friction over many hours of operation.
It would be interesting to hear from others who've kept cars from new out past 100K or so.
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17 Forester 12K MSS 0W-20
12 Accord LX 86K PP 5W-20
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