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 > Mileage observations

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mnaquaman

Farmington, MN

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Posted: 10/29/19 12:03pm Link  |  Quote  |  Print  |  Notify Moderator

We just returned from a 4000 mile road trip. Flatlands, hilly, mountains, wind - everything but rain!

Over the coarse of 29 fuel stops and trying many different speeds, gears & rpms. I think I found the sweet spot - 65mph @ 2100rpm in 5th gear. Running a lower RPM in 6th gear caused a de-crease in fuel economy and the engine felt like it was lugging some. Of coarse if I ran at 55mph I think I would see some improvement - just a bit to slow.

Over the whole trip I averaged 10.22 MPG - 200-300 miles of these miles I was not towing the trailer. I don't really budget my fuel expenses, however I was hoping for 10mpg and half way expecting it to be in the 9's - so overall I am happy with my results.

Worst MPG: 7.62 into a stiff head wind
Best MPG: 11.96 in the mountains, lower speed and thinner air.

Wind & Speed kill MPG - the old rule of increase your speed by 10mph and watch your mileage drop by 10% holds true! I had one day that I was on dead flat roads with no wind 70mph - 9.79mpg, 65mph - 10.96mpg.

2015 Silverado 1500 Crew Cab, 5.3l, 3:42 gears
2017 Jayco 23BHM - weighs in around 6000lbs.


Randy & Sharon Engelland
Farmington, MN
2017 Jayco 23bhm
2015 Chevy Silverado LTZ

LanceRKeys

Amarillo, TX

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Posted: 10/29/19 02:04pm Link  |  Quote  |  Print  |  Notify Moderator

Very interesting. That’s pretty good mileage. One of these days I’ll learn to slow down.

colliehauler

Mc Pherson KS USA

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Posted: 10/29/19 02:25pm Link  |  Quote  |  Print  |  Notify Moderator

I tried one trip to drive 60 instead of my usual 70, It wasn’t worth it. I'll pay extra for the fuel. Maybe if I was on a two lane hwy I could but not on the interstate.

4x4ord

Alberta

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Posted: 10/29/19 05:32pm Link  |  Quote  |  Print  |  Notify Moderator

I've never seen unnecessary down shifting improve my fuel economy. It would be interesting to see a brake specific fuel consumption graph for your engine.


2017 F350 SRW Platinum short box 4x4.
B&W Companion
2008 Citation Platinum XL 34.5

ksss

Eastern Idaho

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Posted: 10/29/19 06:43pm Link  |  Quote  |  Print  |  Notify Moderator

That is good mileage. I would not have guessed you would be over 10 mpg.


2006 GMC 3500 CC 4X4 DRW D/A
2013 Fuzion 342
2011 RZR Desert Tan
2012 Sea Doo GTX 155
2018 Chevy 3500HD CC LB SRW 4X4 D/A
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1320Fastback

Vista, Ca

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Posted: 10/29/19 08:34pm Link  |  Quote  |  Print  |  Notify Moderator

Nice to see a long range report. We did 5,231 miles earlier this year in our 22' Toy Hauler at around 6,300lbs weight. It's a rolling dog kennel with a residential sized deep freeze, coolers and lots of metal pet fencing. We went from CA to LA, up to KY and back to CA. I kept it in 5th which is OD on my manual trans and averaged 14.68mpg going around 62-65 the entire trip. Like you there was around 300 miles of non towing which works out to 19mpg for me.

I love these long trips. Nothing like filling the fuel tank and seeing America!


1992 D250 Cummins, 5spd, 4"' straight piped, sensors deleted, airbags, DAP injectors, 18cm.


edbehnke

North America (from Michigan)

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Posted: 10/30/19 05:57am Link  |  Quote  |  Print  |  Notify Moderator

A lot of work to figure out that pulling a trailer will cause your MPG to be about 9-10 a gallon. But thanks for the reminder.

A friend once told me that anyone who tells you he gets of 10mpg is lying:-)

My MPG is around 9-10pmg when pulling my 16K trailer with my F350.


eddie and sandie
3402 Montana 2013
Ford F350 2015

Lynnmor

Red Lion

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Posted: 10/30/19 06:47am Link  |  Quote  |  Print  |  Notify Moderator

edbehnke wrote:

A lot of work to figure out that pulling a trailer will cause your MPG to be about 9-10 a gallon. But thanks for the reminder.

A friend once told me that anyone who tells you he gets of 10mpg is lying:-)

My MPG is around 9-10pmg when pulling my 16K trailer with my F350.


Yeah, diesels do much better than gas engines.





ppine

Northern Nevada

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Posted: 10/30/19 09:34am Link  |  Quote  |  Print  |  Notify Moderator

"That is good mileage" refering to 10 mpg said no diesel owner ever.

mnaquaman

Farmington, MN

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Posted: 10/30/19 10:20am Link  |  Quote  |  Print  |  Notify Moderator

Even with the same set-up as I have I know everyone will have a different experience and opinion of what is right for them - this is just my opinions and reflections on what I learned with my set-up. Life is a learning experience - will I continue to experiment? I doubt it. However, I will continue to watch what is happening with my fuel economy.

I have been pulling trailers for over forty year and I always knew that I would get 9 - 10mpg.

My main purpose was to dial in my "sweet spot". With over 20 fuel stops and many different conditions I was able to find that "sweet spot"! I was looking for fuel efficiency and driver comfort. Sure I was comfortable going at a higher speeds but at what expense?

Would the truck hold the speed with the cruise control active without massive throttle response to the conditions? At 65mph@2100rpm that was possible. If I tried to run in 6th gear the transmission tended shift down to 5th often and the economy suffered.

Happy camping & Safe travels!!

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