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Best Gas Mileage OIl #5185822 08/13/19 09:49 AM
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cwhard Offline OP
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I have my own ideas about motor oil and MPG which are based on time-honored math calculations and backed-up with an aftermarket digital monitor (to check the math). But I wanted to hear what others have found to be true in real-world testing. I am asking what Oil gives you the best gas mileage and how you know this to be true.

I am assuming that a Synthetic Oil offers less resistance, but I could be wrong. I used to use Exxon Superflo back in the 90's (that's 1990s for you comics). Because after exhaustive testing between Castrol, Pennzoil, then Superflo, I learned which offered less engine resistance thus the best gas mileage. I used a sales route that I ran every week and ran a few tanks through each oil change. The route never changed and since it was rural I used cruise control. Not terribly scientific, but close enough to develop a discernable pattern. The Superflo won handily.

As they say, your mileage may vary, but what is your experience?

Re: Best Gas Mileage OIl [Re: cwhard] #5185844 08/13/19 10:03 AM
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Jimzz Offline
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I doubt you will notice much difference from one to the other. I've known people to run 20w50 and not notice any real changes.

Oils affect will be so much smaller compared to tire type, air pressure, engine upkeep, and most important driving habits.


yup
Re: Best Gas Mileage OIl [Re: cwhard] #5185849 08/13/19 10:06 AM
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Imp4 Online Content
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Originally Posted by cwhard
I have my own ideas about motor oil and MPG which are based on time-honored math calculations and backed-up with an aftermarket digital monitor (to check the math). But I wanted to hear what others have found to be true in real-world testing. I am asking what Oil gives you the best gas mileage and how you know this to be true.

I am assuming that a Synthetic Oil offers less resistance, but I could be wrong. I used to use Exxon Superflo back in the 90's (that's 1990s for you comics). Because after exhaustive testing between Castrol, Pennzoil, then Superflo, I learned which offered less engine resistance thus the best gas mileage. I used a sales route that I ran every week and ran a few tanks through each oil change. The route never changed and since it was rural I used cruise control. Not terribly scientific, but close enough to develop a discernable pattern. The Superflo won handily.

As they say, your mileage may vary, but what is your experience?

How about if you share your data to help start the conversation?


2001 Mitsubishi Galant 2.4 - 165k+
Grandma's creampuff...
Re: Best Gas Mileage OIl [Re: cwhard] #5185851 08/13/19 10:08 AM
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sloinker Offline
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True enough that the less friction on internal engine parts the better the efficiency of the engine. Back in the day Arco tried graphite and it failed due to it clogging up passages and caused engine failure. I suppose now I would look for high Moly content. I'm sure there are other factors, mainly viscosity. Using the lowest viscosity oil that doesn't lead to engine damage would probably be the easiest way. 0W16 is all about the economy.


'16 Tiguan TSI Vaico 5W40
'15 VW Golf TDI Ravenol VMP 5W30
'15 VW Golf Sportwagen TDI VMP 5W30
'14 Dodge Grand Caravan 3.6 Red Line Blue Label 5W20
'64 Plymouth Fury440 Red Line Blue Label 10W40
Re: Best Gas Mileage OIl [Re: cwhard] #5185856 08/13/19 10:13 AM
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ka9mnx Offline
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I've only used conventional oil for one OCI in my Ranger. It's been synthetic for 40 years. The difference between conv and syn was marginal but the syn won. I'm having very good reports with the ST I'm using now. Better than the previous runs of M1. I've always thought syn would give better MPG. It may be marginal but every little thing you do helps and the cost isn't much different.


2005 Ranger 3.0 - SuperTech Syn 5w-30/Motorcraft
2000 4Runner 3.4 - SuperTech Syn 5w-30/Toyota
1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar
1993 F150 4.9 - SuperTech Syn 5w-30/Motorcraft
Re: Best Gas Mileage OIl [Re: cwhard] #5185862 08/13/19 10:20 AM
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rideahorse Offline
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The only way to know the real friction differences would be on a engine dyno for long runs. It would be the only way to keep the variables the same. Your test is a good thought but has no verifiable results that could be replicated

Re: Best Gas Mileage OIl [Re: cwhard] #5185889 08/13/19 10:51 AM
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PimTac Offline
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It would be good if you could share some of your data with us.


2017 Mazda CX5
Valvoline Advanced Synthetic 0w20
Roki OEM filter.
Re: Best Gas Mileage OIl [Re: cwhard] #5185911 08/13/19 11:13 AM
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SirTanon Offline
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It will make little difference.. In most engines, if you went from 0w-20 (which, by nature must be synthetic) to a 5w-30, you might see a small drop in MPG.. perhaps 1-5% difference.. but you would have a hard time actually measuring it. On the other hand, if you went from a full-synthetic 5w-30 to a conventional 5w-30, you would almost certainly get the exact same MPG.

This also assumes that ALL other factors are exactly the same, of course.

Just changing tire pressure by 4 or 5 PSI could result in the same 1-5% change in MPG. Heck, a change in ambient temperature of 10 degrees can even change your MPG by a couple percent.


2013 Nissan Altima SV - 2.5 liter/CVT - 125,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 68,000mi
2010 Ford Fusion - 274k mi - SOLD
Re: Best Gas Mileage OIl [Re: cwhard] #5185963 08/13/19 12:01 PM
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JLTD Offline
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Back in '04 I switched from conventional to synthetic of the same viscosity, as I had a 120 mile round trip once a week.

Driving the same highways at the same speeds, the synthetic gave better mpg and ran cooler.

YMMV


Lates.
Re: Best Gas Mileage OIl [Re: cwhard] #5186098 08/13/19 02:13 PM
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NO2 Offline
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Use synthetic because it sludges less, has better flow properties at low temperatures and lasts longer, creating less waste oil. With modern oils you won't see a noticeable difference between synthetic and conventional at the same viscosity - it only matters at the fleet level.

Re: Best Gas Mileage OIl [Re: cwhard] #5186107 08/13/19 02:20 PM
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nascarnation Offline
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Viscosity is viscosity.

I ran spin loss tests with really good Himmelstein torquemeters comparing syn and petro based transmission fluids and "surprise" they were the same if they had the same viscosity.

Remember that the mpg improvement claims of the early Mobil 1 advertising were based on going to 20wt when almost no OEM was speccing that.

Re: Best Gas Mileage OIl [Re: cwhard] #5186110 08/13/19 02:22 PM
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GumbyJarvis Offline
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During the short OCI (1000mi) I averaged 17.8 MPG according to the dash on Formula Shell Conventional 5w20 and a Carquest Red.

2500mi on the current fill, Schaeffers 5w20 and a Mahle I'm averaging 21.6 MPG

I always leave "Trip B" alone during a OCI to monitor my engine run time on the fill as well as the MPG for the entire fill.

Many factors do play into MPGs as well, probably moreso than oil choice.

Ambient temps, tire pressure, tire brand/model, fuel choice, driving conditions in general, etc. All play a factor. Idk if it was the changing of the oils, or maybe the switch from the previous truck owners Primewell tires (yuck) to the BF Goodrich Rugged Terrain T/A tires I have now, or other factors.

I use 89 octane and Sunoco usually.

Edit: you were the same one who posted the Amsoil post. I'm sure somewhere on their site they have some random graph that says you'll experience a minimal increase in MPGs using their oil, as most if not all oil companies do.

Last edited by GumbyJarvis; 08/13/19 02:33 PM.

2018 Ram 1500 5.7L
Mahle OC614 - Phillip's 66 Shield Choice 5w20
Re: Best Gas Mileage OIl [Re: cwhard] #5186124 08/13/19 02:35 PM
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tiger862 Offline
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Only if I could get an oil to get better fuel mileage when idling.

Last edited by tiger862; 08/13/19 02:35 PM.

Tiger862
2018 Grand Caravan
Re: Best Gas Mileage OIl [Re: cwhard] #5186145 08/13/19 02:55 PM
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Marco620 Offline
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I would say redline oil but it's too thick by hths standards. I would look to a really basic oil like a Grp3 0w20 or whatever your can recommends.


15' Civic 1.8 i-vtec 311,000 mi M1 0w30 & LG Biotech, BP CVT Fluid,GUMOUT W/ PEA
Doberman Whisperer!
E pluribus unum.

Re: Best Gas Mileage OIl [Re: cwhard] #5186166 08/13/19 03:12 PM
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ARB1977 Offline
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Only way to improve fuel economy is the driver.


2015 Tacoma 4.0L 60K (as of 02/23/18)
AMSOIL SS 0W30 / Toyota filter

2018 CRV 1.5L (as of 05/11/18)
Factory fill / Honda filter
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