Detroit 6V92 MPG

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Detroit 6V92 MPG

March 01, 2018, 08:23:07 pm

I was pretty shocked today. I guess I've avoided this calculation but today we averaged 7MPG while towing my Jeep. This seems pretty low. This route was pretty average...we drove from Hardeeville SC to Boone, NC. Temps were in the 50-60 range and it was cloudy. All but the last 10 miles was fairly flat.

I'd love to hear what others get with the Detroit engine.

Thanks all.

Jeff

Re: Detroit 6V92 MPG

Reply #1 – March 01, 2018, 08:39:04 pm

Just bought a used 1994 Detroit the previous owner said he got 12 mpg I haven't tested his mpg forecast but he has lied abut everything so far. Hope he is telling the truth about 12 mpg.

Re: Detroit 6V92 MPG

Reply #2 – March 01, 2018, 09:00:25 pm

That's in the ball park for ours Jeff sometimes a little better more like 7.5 after having a Eagle bus with a 8v92 and getting 5 or 6 were pretty happy

Re: Detroit 6V92 MPG

Reply #3 – March 01, 2018, 09:18:22 pm

Thanks Andy....I think

Re: Detroit 6V92 MPG

Reply #4 – March 01, 2018, 09:26:25 pm

My 91 seems to average overall about 8.3 . I have checked it on our trip to sturgis,Sd and overall mileage was 8.3. Some legs more some legs less. I also have checked it going to Daytona same report. And on a trip Ga with in-laws same.With that said there are so many variables. You have 50 more horsepower than me. Your coach probably weighs more etc. Wind, hills all add into the equation. Maybe you have not found the sweet spot RPM yet. It really does not matter what the mileage is. Look at it this way. A new or newer coach in this class is going to run you 300k-450k range right? You bought your rig way less than that I'm sure. And it is as they say, The Cream Da La Cream, Yours came pretty much turn key. The difference buys a hell of a lot of fuel even at 7mpg. That big shiny thing that just passed you isn't do any or much better.
And, When you get to the campground, Which one is everyone looking at! Look at it as the cost of Cool!

Re: Detroit 6V92 MPG

Reply #5 – March 01, 2018, 09:31:09 pm

Good point all, thanks Stump

Re: Detroit 6V92 MPG

Reply #6 – March 01, 2018, 10:01:40 pm

Somebody once told me to drive a 4 stroke diesel pretending you have a uncooked egg between your foot and the throttle pedal. Steady pressure while accelerating so your not overfuelling it, and very little black smoke. 6v92 is a different animal to drive. How fast we're you traveling?

Re: Detroit 6V92 MPG

Reply #7 – March 01, 2018, 10:04:18 pm

40' coach towing 2,700 Tracker - ISM 450HP generally about 75 MPH on the highway.

6.5 - 6.8 is about what I see on the VMSPC - some times more, less in hills and heavy winds

Your two stroke doesn't seem to be out of line for a 40' coach, but others with your combination will I am sure will chime in.

Tim Fiedler

Sure Start Soft Start

TCER Direct generator-gas-prod 630 240-9139
Gen-Pro

Re: Detroit 6V92 MPG

Reply #8 – March 01, 2018, 10:10:22 pm

Phred my engine seems to just do it's thing about 1725 rpm it's about 65 66 mph it just sounds like it happy. It also likes around 1800 rpm. Not much more not much less. But 1725 is where I usually run it.

Re: Detroit 6V92 MPG

Reply #9 – March 01, 2018, 10:17:07 pm

You guys shouldn't complain, just finished a 3100 mile trip in my 6 cylinder 4-stroke "fuel efficient engine" coach.
Overall average for trip.... 7.0 mpg.

Re: Detroit 6V92 MPG

Reply #10 – March 01, 2018, 10:24:35 pm

Quote from: stump – March 01, 2018, 10:10:22 pm

Phred my engine seems to just do it's thing about 1725 rpm it's about 65 66 mph it just sounds like it happy. It also likes around 1800 rpm. Not much more not much less. But 1725 is where I usually run it.

I am guessing Jeff has a 102" wide coach so he's pushing about 4.5 sqft more of frontal area, plus stumps is a rear radiator and that may help filling the drag behind the coach. Just s guess.

Re: Detroit 6V92 MPG

Reply #11 – March 01, 2018, 10:26:23 pm

After lots of mods I had a good increase in mpg. So I tow faster now to use it up. Our coach is lighter than the coaches mentioned so any comparison is off.

Big improvement in power and mpg with a resonator, different fan drive controller and a blue tech air filter and excellent batteries and a rebuilt alternstor.

Plus the newer Michelin's better rolling resistance.

Re: Detroit 6V92 MPG

Reply #12 – March 01, 2018, 11:04:29 pm

Yep! That big rear engine fan pushes me down the road just like a airboat ! Yep, Luxury Airboat for sure@

Re: Detroit 6V92 MPG

Reply #13 – March 02, 2018, 08:08:18 am

I must be doing something wrong. My lousy "fuel sipper" 8.2 Detroit Diesel turbocharged V8 gets 9 MPG or better, and this is the engine almost nobody likes (hi Brett). Scary to think what MPG it will get after it is broken in!! Wonder what it gets without towing our 2006 Saturn Vue. Bet the MPG is so good due to the small dinky compartments where we can't store much. Maybe the narrow width, or the aerodynamic shape? Or that we drive at 58-60 MPH? Could it be that old 1989 technology? All mechanical, no computers??
Maybe the real shiny finish lets the coach "slide" thru the air??

Re: Detroit 6V92 MPG

Reply #14 – March 02, 2018, 09:26:44 am

58-60 is the main factor in your equation I would think - along with the engine/trans/gearing combo.

Cant drive that slow, life is short, too many items on bucket list.

"Do what makes you happy" fits me as to my 75 - 80 MPH habit

I am amazed at how I search out the cheapest gas prices (just paid $1.95 a gallon this week in Galveston for 87 octane after grocery store rebate) and triumph over saving .02 a gallon on 20 gallons when none of that will ever make a difference in my lifestyle.
Always figured .50 a mile to move the coach - will be more or less depending on the price of diesel, but that is my basic premise

from Galveston heading to NAC for some stuff and then back to Seattle area. Credit cards will get a work out, but 150 gal tank gives me 700 miles to get the best price along the route.

Put Diesel in anytime I am down by 60 gallons or ore per VMSPC, I see a good price and I need to stop for some other biological reason.

Tim Fiedler

Sure Start Soft Start

TCER Direct generator-gas-prod 630 240-9139
Gen-Pro

Re: Detroit 6V92 MPG

Reply #15 – March 02, 2018, 09:58:34 am

Cant drive that slow, life is short, too many items on bucket list

I am amazed at how I search out the cheapest gas prices (just paid $1.95 a gallon this week in Galveston for 87 octane after grocery store rebate) and triumph over saving .02 a gallon on 20 gallons when none of that will ever make a difference in my lifestyle.
Tim I do the same thing. It is because earning the money is hard work keeping it is even harder! Even just a few pennys. There is nothing wrong with that.

Re: Detroit 6V92 MPG

Reply #16 – March 02, 2018, 10:30:47 am

Quote from: Tim Fiedler – March 02, 2018, 09:26:44 am

Cant drive that slow, life is short, too many items on bucket list. "Do what makes you happy" fits me as to my 75 - 80 MPH habit

X2...I don't "shop", ease of in and out is my focus, seen too many coaches dinged-up by trying to get into/out of a cheap fuel stop. Don't keep track of the mileage anymore, I know I'll never get the 15mpg the Airstream/Isuzu did, but the top end of this coach, being far in excess of the AS, more than makes up for the mileage. I love passing semis!

Re: Detroit 6V92 MPG

Reply #17 – March 02, 2018, 10:35:06 am

I think the fuel price thing is my OCD

Re: Detroit 6V92 MPG

Reply #18 – March 02, 2018, 10:37:57 am

97 U295 36'.....3126 300 HP Cat....1700 rpm range.......63 mph....Happy place for me and the motor home towing a jeep Wrangler.....Happy when I see anything in the 7 MPG range on silverleaf........I fill at 1/2 tank too, unless I know cheaper fuel is down the road
I have had every kind of RV combo over 50+ years, never had one to get better then 8 MPG
Chris

Re: Detroit 6V92 MPG

Reply #19 – March 02, 2018, 10:51:12 am

My 1994 U300 6V92 over the last 10 years, and about 35,000 miles, has averaged about 6.5 MPG. I am towing a Jeep Grand Cherokee or Dakota P. U. 6 to 6.5 up and down hills, 7 or 7+ flat land. I do carry a lot of "stuff" that I do not need but You never know.

Keep the Air Cleaner "Clean" makes a big difference.

Re: Detroit 6V92 MPG

Reply #20 – March 02, 2018, 10:53:07 am

We do quite a bit go shopping on both gas and diesel. A mile or 2 out of my way to save 10-15 cents I'll take that any day. If you don't burn 100 gallons of fuel a year doesn't make much difference, 12-1500gal different story. As Stump says it's hard to make those nickels and dimes even harder to keep em.

Re: Detroit 6V92 MPG

Reply #21 – March 02, 2018, 11:12:03 am

Quote from: Tim Fiedler – March 02, 2018, 10:35:06 am

I think the fuel price thing is my OCD

O.K., I give....what's "OCD" mean?

Re: Detroit 6V92 MPG

Reply #22 – March 02, 2018, 11:32:11 am

Obsessive, Compulsive, Disorder.

Re: Detroit 6V92 MPG

Reply #23 – March 02, 2018, 11:58:00 am

Words to live by:
1. My father use to tell me when I was growing up and the family was RVing, "if you have to worry about the mileage and the cost of fuel you are in the wrong hobby".
2. Don't get me started on mileage of 8 cy Detroit diesels. My Chris Craft had twin 8 cy Detroit's. Use to cost me $500 bucks to travel from Sacramento to San Francisco (about 120 miles). I know, I know, "apples and oranges". Just saying.......
3. Just waxed my rig and I swear I picked up another mile to the gallon on the mileage.

Re: Detroit 6V92 MPG

Reply #24 – March 02, 2018, 12:00:19 pm

1997 U295...3126 CAT...Towing Jeep Wrangler...7.9 on Silverleaf constantly...Like Chris approx. 63 MPH seems to be the sweet spot.

John

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