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Discussion Starter · #1 · (Edited)
We recently made a trip from Missouri to Ohio and back. It's 515 miles 1 way. The truck did great. Stock 2017 Canyon with a Leer truck cap and probably 400 lbs of weight in the back (dogs included :) ).

Got the best 450 mile average on the way there (pictured below) to 31.1 from 29.9 and then increased it on the way back to Missouri to 31.4. Truck consistently ran 33-36 mpg on the instant screen. Even the 2 regens it went through, it was averaging 24-25 mpg. Had the cruise set at 71 mph.

These numbers are all up from my normal. I have been running AMSOIL Cetane booster but haven't noticed a lot of difference. Maybe it has been increasing my mpg' s and I haven't noticed.

However, before I left, I did an oil change and went from Pennzoil Platinum Euro L 5w30 to Valvoline Synpower MST 5w40. I kind of feel like this is the reason for my increased fuel efficiency. Never would have thought that though.

I did hand figure the tank of fuel when filled up before coming back to Missouri (after doing about 100 more miles of non-highway driving) and came up with 27.6 mpg vs the trucks claim of 29.5. Did about 80 miles of non-highway driving after filling up before leaving and when we filled up back in Missouri, we averaged 28.6 mpg. Not positive what the truck claimed but believe it was 30.4 mpg

I am overall happy with it for now. Just thought I would share my hypothesis on my increase of fuel economy due to an oil change from a 5w30 to a 5w40 o_O, or do you just think it took that long for the Cetane booster to actually start working. Or maybe I just haven't been paying that good of attention to the instant readout when driving on the highway?
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Discussion Starter · #2 ·
I meant to put this in the Maintenance forum, but I didn't and now I can't figure out how to move it over to there, or delete this post....
 

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The MST 5w40 is a thinner 40wt. The viscosity difference between Euro L and MST it is small. Is MST "Slicker" even though it has a higher viscosity?

Too many variables. Cetane Boost + 5w40 = 31 MPG @ 71 mph is good. Better than what I get at 65 mph. I think your Leer shell is also helping with aerodynamics at speed.

I use the Fuelly app to track my mileage when filling up. I average 24-25 MPG per tank. Like yours, my DIC is reads high by 1.7-2.0 MPG vs Fuelly hand calculated.

This is 70-60% freeway, 10w40 oil, Goodyear Duratracs and no camper shell. We both have '17 Canyon CCLB w/ AT package.

Instant DIC @ 65 mph is typically 30 mpg so probably really 28 mpg is the best I can do. If I draft behind a van or box truck I can get in the low to mid 30s per gallon.

Maybe try not using the cetane boost next trip to eliminate that variable and see what you get.

Are you using the max dose of cetane boost? 2oz per 10 gals?
 

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Discussion Starter · #4 ·
There are a lot of variables. I didn't have the shell last year when I went home either. I do agree that it may be helping with aerodynamics.

I also did consider leaving out the booster for a few tanks to see if that is the variable or not. And I am running the max rate.
 

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I thought about getting a Leer shell too, they look great on these Canyons. My truck isn't a daily driver, usually it's to do "truck stuff" so having the full bed available is more important right now.

Cetane boosters have a greater effect on poor quality fuels. I don't think the D#2 in the midwest is known to be very good, so using the max dose is probably helping. Cetane value of 50-55 CN is your target to see best results. A warm weather blend additive will have cetane boosters plus other catalysts to reduce smoke/soot and improve lubricity.

Be careful handling that Amsoil cetane booster. It is 100% 2-EHN which is highly flammable, explosive and very toxic. Make sure you use gloves when handling it and/or wash your hands if there is any skin contact.
 

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Discussion Starter · #6 ·
I do enjoy having the top. We have the 100XR. I like the cab height model, whereas the 180 series rises above the truck. That would give more room, but I don't know that I would like the look. The 100R is basic and has 2 turn handles and the glass looks like typical truck cap glass. The XR adds a single turn handle in the middle (which is nice) and automotive style glass to the rear of the shell which gives it a sleek, finished look. The XL keeps the single turn handle (with the ability for auto unlock via keyfob. The XR might have this too, don't remember, I don't have it but I think there was a reason why I didn't get it) and adds automotive style glass to the sides as well which is very sharp looking. Lots of other features too that are on the inside, but those are some of the really big and noticeable differences.

The shell makes it nice for carrying luggage on trips and keeping our dogs a little more shaded in the summer, out of the rain, and a little warmer and out of the wind in the winter. We got the pet screens too on the inside. There are limits though, that keep you from doing some "truck stuff",:) but I also have a 12 -foot utility trailer, so that does my truck stuff for me.

I do think the cetane is helping. Maybe it just took a while, or a few tanks, to actually start making a difference? Not sure though. Warm weather and summer blend diesel definitely helps on the fuel economy as well. And I figured the booster was flammable, I figure that is what Jef Fuel smells like :rolleyes:
 

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Viscosities at the same temperature are directly comparable. The oil with the lower viscosity will improve fuel economy (some significant figures to the right), AND will transmit less shear stress between parts that slide by each other. The name of the game is to have enough vis to maintain the thin film between those parts, while not breaking down from those repeated shear stresses...
 
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