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05-07-2022, 12:04 PM
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#1
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Senior Member
Tiffin Owners Club
Join Date: May 2018
Location: florida
Posts: 179
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Can different engine oils effect miles per gallon?
Wondering if any of the good folks on this forum have experienced a notable increase or decrease in mpg after switching different brands or even different viscosity oils for your diesel coach engine? Have seen this occur in gasoline engines in cars and trucks. Also wondering if changing to synthetic 15-40 diesel might effect mpg. Stay Safe.
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2021 Tiffin Allegro Bus 45OPP East Central Florida
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05-07-2022, 02:44 PM
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#2
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Senior Member
Join Date: Nov 2011
Location: Full time RV'er
Posts: 5,152
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I'd read that it's widely accepted that changing to synthetic will give you a slight mileage increase. I remember reading that 2-3 times a few years ago but can't give you any links.
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05-07-2022, 02:53 PM
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#3
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Senior Member
Join Date: Apr 2020
Posts: 732
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New car manufacturers are now specifying 5W20 or even 5W15 oil. Lubrication properties have improved, and they can get away with thinner oils which definitely improve mileage.
David
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05-07-2022, 03:00 PM
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#4
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Senior Member
Join Date: Jul 2011
Location: CAISTOR CENTRE
Posts: 785
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Went to 5w40 Shell T6 from Shell 15w40 mineral and did notice a slight MPG gain over a long haul (3000 miles). Although in saying that so many variables come into play. Weather, driving speeds, time of year. Lets face it we will never put enough miles on these units to wear them out so oil choice is just that ,, your choice.
joe
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05-07-2022, 03:07 PM
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#5
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Registered User
Join Date: Jan 2021
Posts: 2,184
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Quote:
Originally Posted by greeneville1
Wondering if any of the good folks on this forum have experienced a notable increase or decrease in mpg after switching different brands or even different viscosity oils for your diesel coach engine? Have seen this occur in gasoline engines in cars and trucks. Also wondering if changing to synthetic 15-40 diesel might effect mpg. Stay Safe.
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What oil does the engine manufacturer recommend for your coach? Is the engine still under warranty?
I use what the engine manufacturer recommends, primarily because I’m more concerned about the longevity of the engine than I am about getting an additional 2/100ths of a mile out of a gallon of fuel.
Drive 5-10mph slower than you normally do if you want to see a notable increase.
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05-07-2022, 03:12 PM
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#6
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Senior Member
Join Date: Oct 2014
Posts: 7,882
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IMO, changing from engine manufacturer's oil recommendation (specs and viscosity) in the HOPES of gaining a few tenth of a MPG is a very BAD idea.
No question, speed and the driver are the two most significant influences on MPG.
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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05-08-2022, 05:12 AM
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#7
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Senior Member
Join Date: Oct 2011
Posts: 1,065
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Agree wholeheartedly with Wolfe10.
For those that drive with a software performance monitoring system, it is quite evident the fluctuation in MPG given the envirormental conditions, terrain and most importantly, the miles per hour.
Fuel consumption wise, my coach with towed serves me best at 62 mph and if it is real windy, 60 is my best friend.
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05-08-2022, 06:20 AM
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#8
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Senior Member
Join Date: Jul 2014
Posts: 35,446
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The manufactures use thinner oils for tiny increases in MPG for the whole category of vehicles, in an effort to meet the EPA requirements.
I don't think it would even be measurable, in one engine.
Slowing down saves gas.
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05-08-2022, 09:25 AM
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#9
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Senior Member
Join Date: Jul 2011
Location: CAISTOR CENTRE
Posts: 785
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Quote:
Originally Posted by twinboat
The manufactures use thinner oils for tiny increases in MPG for the whole category of vehicles, in an effort to meet the EPA requirements.
I don't think it would even be measurable, in one engine.
Slowing down saves gas.
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Slowing down is very correct. Although I just have problems doing it. LOL.
__________________
1996 MONACO SIGNATURE 40FT 450HP M11 CUMMINS ALLISON 6 SPEED HD4060 SINGLE AXLE ROCKWELL 4.33 RATIO
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05-08-2022, 09:51 AM
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#10
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Senior Member
Monaco Owners Club Freightliner Owners Club Holiday Rambler Owners Club
Join Date: Sep 2019
Location: Thornville, Ohio
Posts: 3,699
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back in the late 70's when Mobile-1 came out. That was part of the sale pitch "improve mpg". I used it then and saw maybe 1/5 mile improvement per gallon. Or was it, I wanted to see it and changed my driving habits? Im thinking that the improvement is during the warm up. The oil performs better.
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Art & Joyce
Thornville, OH
Kia Soul pushing a 36' DP Endeavor
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05-08-2022, 09:53 AM
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#11
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Senior Member
Join Date: Nov 2011
Location: Full time RV'er
Posts: 5,152
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Where this idea comes from is from companies with fleets of semis, I believe. Those trucks can often rack up millions of miles and it's easier to see a slight advantage to synthetic with 100's of trucks and 100's of thousands of miles traveled.
But as said, you'd likely get a larger increase in mileage by slowing down. And those that haven't done it yet, adding things like Eco-Fins, V-Spoilers, or AirTabs to the rear edge of your RV will get you a solid 5% increase in fuel economy. And get you more stability when big trucks or buses pass you on the freeway or a country road.
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05-08-2022, 10:05 AM
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#12
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Registered User
Join Date: Apr 2020
Posts: 1,603
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The main feature of engine oil that can affect MPG is its viscosity. A high viscosity oil requires more energy to churn it around so it will result in a slightly lower MPG. Switching to a synthetic can improve your MPG because you can get away with a lower viscosity oil. The reason you can get away with it is because synthetics have a much higher viscosity index, meaning that as the engine heats up the oil doesn't thin out as much as a straight mineral oil, i.e., it maintains its viscosity over a greater temperature range.
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05-08-2022, 11:58 AM
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#13
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Senior Member
Join Date: Apr 2004
Posts: 3,797
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Correct. the federal acronym is CAFE: Corporate Average Fuel Economy. It varies for different classes of vehicles. that's why the Plymouth PT Cruiser was actually certified as a "Light Truck" since light trucks have a lower CAFE number.
Quote:
Originally Posted by twinboat
The manufactures use thinner oils for tiny increases in MPG for the whole category of vehicles, in an effort to meet the EPA requirements.
I don't think it would even be measurable, in one engine.
Slowing down saves gas.
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__________________
George Schweikle Lexington, KY
2005 Safari (Monaco)Trek 28RB2, Workhorse W20, 8.1, Allison 1000 5 spd, UltraPower engine & tranny, Track bars & sway bars, KONI FSD, FMCA 190830, Safari Int'l. chapter. 1999 Safari Trek 2830, 1995 Safari Trek 2430, 1983 Winnebago Chieftain, 1976 Midas Mini
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05-08-2022, 01:11 PM
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#14
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Registered User
Join Date: Jan 2021
Posts: 2,184
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Quote:
Originally Posted by joeplazek
Went to 5w40 Shell T6 from Shell 15w40 mineral and did notice a slight MPG gain over a long haul (3000 miles). Although in saying that so many variables come into play. Weather, driving speeds, time of year. Lets face it we will never put enough miles on these units to wear them out so oil choice is just that ,, your choice.
joe
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I have a car that uses 0W20. Why not give that a try?
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