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what caused my 3 mpg increase? #4654031
02/02/18 04:50 PM
02/02/18 04:50 PM
Joined: Dec 2012
Posts: 605
Washington for now
WhyMe Offline OP
WhyMe  Offline OP
Joined: Dec 2012
Posts: 605
Washington for now
at 90k i did 3 things as maintance on the 2011 crv

new tires
valve adjustment
oil change with pup 5 -20 . last one was 5-30 castrol mangnatec

i was getting about 19.5 mpg according to the computer before these things were done. now i get about 22.5 .3 mpg more.

i am wondering which of these 3 things caused the mpg increase. or is it a combo of all three?

Last edited by WhyMe; 02/02/18 04:50 PM.
Re: what caused my 3 mpg increase? [Re: WhyMe] #4654035
02/02/18 05:03 PM
02/02/18 05:03 PM
Joined: Nov 2008
Posts: 3,157
Oshawa, Ontario Canada
JC1 Offline
JC1  Offline
Joined: Nov 2008
Posts: 3,157
Oshawa, Ontario Canada
Maybe the old tires were under inflated? Could be a a combo of all three or did you change your driving style or you did more hwy miles as well?


2015 Grand Caravan SXT Plus 5w-20 PPPP/Fram Ultra Filter
1997 Honda Civic CX 5w-30 Shell Conventional/Fram Ultra Filter
Re: what caused my 3 mpg increase? [Re: WhyMe] #4654036
02/02/18 05:04 PM
02/02/18 05:04 PM
Joined: Mar 2017
Posts: 5,422
Soviet State of Washington
PimTac Online content
PimTac  Online Content
Joined: Mar 2017
Posts: 5,422
Soviet State of Washington
I would say the oil would be the least effective on fuel economy. Tires would be my guess. Maybe your old tires were not inflated properly?


2017 Mazda CX-5 Grand Touring

Valvoline Advanced Synthetic 0w20
Mobil 1 M108A EP filter

Re: what caused my 3 mpg increase? [Re: JC1] #4654038
02/02/18 05:06 PM
02/02/18 05:06 PM
Joined: Dec 2012
Posts: 605
Washington for now
WhyMe Offline OP
WhyMe  Offline OP
Joined: Dec 2012
Posts: 605
Washington for now
Originally Posted By: JC1
Maybe the old tires were under inflated? Could be a a combo of all three or did you change your driving style or you did more hwy miles as well?


nope drive the same. i check it over 3 fill ups. i check the tires all the time. i am curious if its the oil as i beleve pennzoil states there will be a mileage increase when using it

Re: what caused my 3 mpg increase? [Re: WhyMe] #4654039
02/02/18 05:06 PM
02/02/18 05:06 PM
Joined: Aug 2008
Posts: 3,156
USA
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,156
USA
Did you switch to a narrower tire or a lighter tire?

Re: what caused my 3 mpg increase? [Re: Reddy45] #4654047
02/02/18 05:13 PM
02/02/18 05:13 PM
Joined: Jan 2008
Posts: 10,670
OH
SatinSilver Offline
SatinSilver  Offline
Joined: Jan 2008
Posts: 10,670
OH
The new tires could be LRR, low rolling resistance and the old ones weren't.

Re: what caused my 3 mpg increase? [Re: WhyMe] #4654051
02/02/18 05:18 PM
02/02/18 05:18 PM
Joined: Sep 2009
Posts: 71
Murfreesboro, TN
Veilside Offline
Veilside  Offline
Joined: Sep 2009
Posts: 71
Murfreesboro, TN
All helped. Biggest contributor is increased tread depth of new tires.


2011 Hyundai Sonata 2.4 GDI
2011 Toyota Sienna Limited
Re: what caused my 3 mpg increase? [Re: WhyMe] #4654052
02/02/18 05:19 PM
02/02/18 05:19 PM
Joined: Sep 2009
Posts: 16,009
OH
fdcg27 Online content
fdcg27  Online Content
Joined: Sep 2009
Posts: 16,009
OH
Over what number of tanks have you seen this improvement in observed fuel mileage?
I can't see the things that you've done yielding a 15% improvement in fuel economy.
I suspect that you're observing a fluke that will revert to the mean.


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
Re: what caused my 3 mpg increase? [Re: WhyMe] #4654055
02/02/18 05:20 PM
02/02/18 05:20 PM
Joined: Dec 2002
Posts: 42,085
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,085
New Jersey
Same tire size?

Bet you got less resistive tires, running thinner oil, and are breatihing/running more efficient due to the valves.

Re: what caused my 3 mpg increase? [Re: WhyMe] #4654070
02/02/18 05:39 PM
02/02/18 05:39 PM
Joined: Dec 2012
Posts: 605
Washington for now
WhyMe Offline OP
WhyMe  Offline OP
Joined: Dec 2012
Posts: 605
Washington for now
same tire size rt 43 general. i just filled up at costco and am at 22.7 over 20 miles 50/50.i get gas at the same costco allthe time.

Re: what caused my 3 mpg increase? [Re: WhyMe] #4654072
02/02/18 05:44 PM
02/02/18 05:44 PM
Joined: Jan 2009
Posts: 6,179
New England
gathermewool Online content
gathermewool  Online Content
Joined: Jan 2009
Posts: 6,179
New England
New tires typically give me worse gas mileage (squirmier tread).

How much did you have to adjust the valves. The amount of adjustment needed is a pretty important detail to leave out, don't you think???


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter
Re: what caused my 3 mpg increase? [Re: WhyMe] #4654075
02/02/18 05:47 PM
02/02/18 05:47 PM
Joined: Mar 2016
Posts: 1,226
CA
CharlieBauer Offline
CharlieBauer  Offline
Joined: Mar 2016
Posts: 1,226
CA
I noticed an mpg increase when going from nearly worn out summer tires to new all seasons.


It ain't what you don't know that gets you into trouble. It's what you know for sure that ain't so.

- mistakenly attributed to Mark Twain
Re: what caused my 3 mpg increase? [Re: WhyMe] #4654079
02/02/18 05:50 PM
02/02/18 05:50 PM
Joined: Jan 2016
Posts: 315
Cheshire, England
barryh Offline
barryh  Offline
Joined: Jan 2016
Posts: 315
Cheshire, England
Leaving differences of rolling resistance between two different makes of tire aside, rolling resistance increases with tread depth so new tires seem unlikely to have contributed to the improvement in MPG, quite the opposite.

Not sure what you mean by valve adjustment but on old engines without hydraulic lifters changing the valve clearances makes small but real changes to valve timing, lift and most important for low rev efficiency - overlap.


Barry

1979 BMW R45 (Triple QX 5W40)
2009 Mercedes C180K (Shell Helix Ultra 5W40)
Re: what caused my 3 mpg increase? [Re: WhyMe] #4654099
02/02/18 06:07 PM
02/02/18 06:07 PM
Joined: Jul 2017
Posts: 542
Texas (south)
FermeLaPorte Offline
FermeLaPorte  Offline
Joined: Jul 2017
Posts: 542
Texas (south)
I also got a 5 mpg increase in mpg. But I did began to buy ethanol-free gas.


Always Mobil 1
2014 1.6L Nissan Versa Sedan, 5 spd, 5k OCI.
2011 3.5L Chevrolet Impala, Automatic, 5k OCI.
Re: what caused my 3 mpg increase? [Re: WhyMe] #4654114
02/02/18 06:15 PM
02/02/18 06:15 PM
Joined: Nov 2011
Posts: 1,053
Lyndhurst NJ
Audios Online content
Audios  Online Content
Joined: Nov 2011
Posts: 1,053
Lyndhurst NJ
Id imagine the valve adjustment did something as well, especially if they needed a decent amount of adjustment.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
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