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Better MPG with age and miles #4417516
05/29/17 07:27 PM
05/29/17 07:27 PM
Joined: Oct 2005
Posts: 1,662
South Dakota
otis24 Offline OP
otis24  Offline OP
Joined: Oct 2005
Posts: 1,662
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.


1991 Chevrolet K1500 (4.3, 4x4, 86k miles)

2016 Dodge Grand Caravan
(3.6 V6) 46500 miles
Re: Better MPG with age and miles [Re: otis24] #4417528
05/29/17 07:34 PM
05/29/17 07:34 PM
Joined: May 2010
Posts: 9,047
North Carolina
spasm3 Offline
spasm3  Offline
Joined: May 2010
Posts: 9,047
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.


13 elantra 70k 5w30 QSUD
03 chevy avalanche79k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 5600 miles m1 0w30
Re: Better MPG with age and miles [Re: otis24] #4417537
05/29/17 07:45 PM
05/29/17 07:45 PM
Joined: Feb 2013
Posts: 10,689
Phoenix, AZ
Nick1994 Online content
Nick1994  Online Content
Joined: Feb 2013
Posts: 10,689
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.


2015 Hyundai Sonata 2.4L 84k Mobil 1 AFE 0w30 & OEM
2000 Toyota Camry 2.2L 230k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: Better MPG with age and miles [Re: otis24] #4417538
05/29/17 07:46 PM
05/29/17 07:46 PM
Joined: Oct 2005
Posts: 1,662
South Dakota
otis24 Offline OP
otis24  Offline OP
Joined: Oct 2005
Posts: 1,662
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.

Last 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
Re: Better MPG with age and miles [Re: otis24] #4417552
05/29/17 07:56 PM
05/29/17 07:56 PM
Joined: Sep 2004
Posts: 7,525
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,525
Marshfield , MA
Are you using e0 vs e 10?


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Better MPG with age and miles [Re: otis24] #4417558
05/29/17 07:59 PM
05/29/17 07:59 PM
Joined: Jan 2011
Posts: 2,943
PV Az
AZjeff Offline
AZjeff  Offline
Joined: Jan 2011
Posts: 2,943
PV Az
So they averaged 20-21 and you got 27-29 on a long distance xc trip going east? Sounds normal.


86 Samurai 1.3 leftovers
14 RAV4 2.5 5W-20 PP
16 Silverado 1500 4.3, DI, AFM 5W-30 PP

The most important thing to do in your life is to not interfere with someone else's life. - Frank Zappa

Re: Better MPG with age and miles [Re: otis24] #4417689
05/29/17 10:11 PM
05/29/17 10:11 PM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
Waco, TX
Maybe it's so loose, internal engine friction is nearing zero grin


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Better MPG with age and miles [Re: otis24] #4417698
05/29/17 10:32 PM
05/29/17 10:32 PM
Joined: Oct 2005
Posts: 1,662
South Dakota
otis24 Offline OP
otis24  Offline OP
Joined: Oct 2005
Posts: 1,662
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
Re: Better MPG with age and miles [Re: otis24] #4417702
05/29/17 10:55 PM
05/29/17 10:55 PM
Joined: Oct 2012
Posts: 4,607
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,607
Taiwan
I get better mileage as I get older, because I don't drive so fast.

Re: Better MPG with age and miles [Re: Ducked] #4417763
05/30/17 03:13 AM
05/30/17 03:13 AM
Joined: Aug 2014
Posts: 1,453
Gulf Coast, MS
3800Series Offline
3800Series  Offline
Joined: Aug 2014
Posts: 1,453
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.

Last edited by 3800Series; 05/30/17 03:16 AM.
Re: Better MPG with age and miles [Re: otis24] #4417786
05/30/17 05:33 AM
05/30/17 05:33 AM
Joined: Oct 2009
Posts: 3,947
Ohio
L_Sludger Offline
L_Sludger  Offline
Joined: Oct 2009
Posts: 3,947
Ohio
It has the most to do with the nut behind the steering wheel, and driving habits. Then maintenance including tire pressure.


too many cars and oil combinations to list in 150 characters or less
Re: Better MPG with age and miles [Re: otis24] #4417874
05/30/17 08:26 AM
05/30/17 08:26 AM
Joined: Jun 2003
Posts: 5,921
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,921
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.



2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Better MPG with age and miles [Re: otis24] #4417967
05/30/17 10:16 AM
05/30/17 10:16 AM
Joined: Sep 2015
Posts: 5,857
Kalifornia Kollective
BrocLuno Online content
BrocLuno  Online Content
Joined: Sep 2015
Posts: 5,857
Kalifornia Kollective
Tail wind going east laugh


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Better MPG with age and miles [Re: andyd] #4418013
05/30/17 11:03 AM
05/30/17 11:03 AM
Joined: Apr 2010
Posts: 4,398
Storrs, Connecticut
jeepman3071 Offline
jeepman3071  Offline
Joined: Apr 2010
Posts: 4,398
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.


2000 Jeep Cherokee 4.0L (180k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (33k) - Castrol Edge Euro 0w40, MANN HU816X
Re: Better MPG with age and miles [Re: otis24] #4418277
05/30/17 04:48 PM
05/30/17 04:48 PM
Joined: Sep 2009
Posts: 16,009
OH
fdcg27 Online content
fdcg27  Online Content
Joined: Sep 2009
Posts: 16,009
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.


17 Forester 12K MSS 0W-20
12 Accord LX 92K PP 5W-20
09 Forester 95K M1HM 10W-30
01 Focus ZX3 118K PP 5W-20
96 Accord LX 104K T5 10W-30
95 318i
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