23 mpg over 600 miles

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Muddy Bean said:
Here's a pic of my tire size. I got dressed and went outside and just took the photo (florida nights are much warmer than Michigan nights):



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Our truck weighs in at around 5800 lbs right now. Once again, I'm running 51 psi and no roof rack. No mods or steel bumpers. Only running a Tbar crank. Wasn't trying to start anything, just wanted to encourage those who wanted to see what the truck could do if driven carefully. I don't know how to prove it to the doubters any more than my photos and my word. but my grandma still doesn't believe we went to the moon. Oh well. Onto my next adventure. Over and out.

Sent from my iPhone using IH8MUD while navigating gnarly trail. Typos are inherent.
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No need to get defensive. We are just curious and discussing an interesting issue while trying to figure out an explanation. If you have found a way to get over 22mpg I want to know how... :)

Anyway, that would be a 30.6" nominal diameter I think, so indeed very close -within a couple of percents or so- of OEM which from memory I think was a 275/70 back then, so not likely to be the source of a big error. And no, I don't think that 51 psi would lead to a noticeable increase in diameter either.

On a related safety note, though, is that some dry-cracking I see in your tire?
 
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e9999 said:
No need to get defensive. We are just curious and discussing an interesting issue while trying to figure out an explanation. If you have found a way to get over 22mpg I want to know how... :)

Anyway, that would be a 30.6" nominal diameter I think, so indeed very close -within a couple of percents or so- of OEM which from memory I think was a 275/70 back then, so not likely to be the source of a big error. And no, I don't think that 51 psi would lead to a noticeable increase in diameter either.

On a related safety note, though, is that some dry-cracking I see in your tire?
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I'm not sure what you're missing here? Go on your local CA freeway, and drive per #1 and #3 in the o.p. I'd wager you've never done this... it is not an every-day driving style.
 
Muddy, thanks for the test and for posting the results. It's an interesting discussion. I hope others try it and you try it again to verify the results.

I don't doubt them. I was able to get 16-17mpg driving from CO to PA with oversized tires, a lift and some extra weight while doing 65-70mph. I'm betting a large portion of the increased gains come in that 200-400rpm difference b/w the 55mph you did and the 65-70 that most of us consider moderate/slow driving.
 
fireball said:
... I'm betting a large portion of the increased gains come in that 200-400rpm difference b/w the 55mph you did and the 65-70 that most of us consider moderate/slow driving.
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I agree. BTW, I also don't consider 55 in a 70 MPH zone a "safe" procedure, rendering this exercise to be largely academic...
 
re_guderian said:
I agree. BTW, I also don't consider 55 in a 70 MPH zone a "safe" procedure, rendering this exercise to be largely academic...
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I'll agree with that. Going that much slower does not make me feel good, but huge props to muddy for staying true to the commitment.
 
fireball said:
... I'm betting a large portion of the increased gains come in that 200-400rpm difference b/w the 55mph you did and the 65-70 that most of us consider moderate/slow driving.
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I agree. BTW, I also don't consider 55 in a 70 MPH zone a "safe" procedure, rendering this exercise to be largely academic...
 
I am sure it can be done if you are willing to drive 55mph, i have not own a 100 yet. But I have scored 22 mpg on my 80 accidentally travelling at 45-50 mph from Telluride to Moab. Fully loaded 2" lifted no roofrack. My bro is behind me with roof rack and half a slider on top of it. He got 19.5 mpg. We were forced to drive that slow behind a slow truck and few cars all the way. If I drive 75mph, it would be 12mpg. City about 11-12mpg! So I drive like a old lady too now most of the time :)
 
TXLX100 said:
On behalf of everyone. GTFO here!

I filled up today with 20 gallons after 260 miles, 13 MPG on 87 octane.
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This made me laugh really hard. I needed this today. Thanks TXLX100....

I filled up today and looks like I am gettin 14 in the city with 255/85/16 MTs, diff in good working order, factory rack on for the ski season (usually Gamaviti installed), sliders bumpers, skids, pulled fridge and drawer for ski season....

I am still laughing about the "on behalf of everyone, GTFO here!" classic.
 
you don't buy an all wheel drive V8 for fuel economy, but

my prescription for better mileage:
bosch 4 prong plugs
K&N air filter
91 octane shell V-Power gas
tall tires

then calculate how far off your dash odometer is by using a hand held GPS.
I have found the number to be as high as +8% for mileage (dash odo will tell you that you are getting worse performance)
and about 3 mph for speed

I have also found that very few people will chose to believe this
 
wolffo said:
I have also found that very few people will chose to believe this
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I am one of those. Tried pretty much all mentioned, except the plugs (which I think is a joke on any type of performance gains), and have not noticed any changes in MPG. I am netting worse MPG with taller tires, however.
 
I have changed my driving habits after reading this thread. Namely 2 things: drive like I have no brakes, and never exceed 2000 rpm. In town mileage has gone from 11.5 to 13.5. Noticeable difference.
 
Just an FYI, staying below 2K RPM's takes me almost a mile to accelerate to freeway merging speeds. Yes, noticeable increase MPG's, but also noticeable increase in people flipping me the bird... It's a nice gee-whiz style of driving, but again, not practical for the everyday, unless you enjoy pissing people off.
 
Pretty sure I read all the posts and no mention of ethanol content? OP said 93 octane but never said if he was running pure gas or E10. Its apples and oranges people.
 
ethanol has about 2/3 of the energy content of gasoline per unit volume, IIRC. At the 10% (max?) level, that would be roughly a 3% decrease in mpg, everything else the same. So more like apples and 3% different apples... :)
 
Chris Sandstorm FJ said:
This made me laugh really hard. I needed this today. Thanks TXLX100....

I filled up today and looks like I am gettin 14 in the city with 255/85/16 MTs, diff in good working order, factory rack on for the ski season (usually Gamaviti installed), sliders bumpers, skids, pulled fridge and drawer for ski season....

I am still laughing about the "on behalf of everyone, GTFO here!" classic.
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Glad I could help. I don't see how 25 mpg is possible outside of perfect driving, downhill, downwind for 600 miles. I drive my stock 98 lightly and the best I have got is 15 on the highway. I can't think of anything else to increase MPGs in my truck, other than higher octane (which I tried and wasn't worth the extra money). I Guess I'm part of the 99%!

http://www.fueleconomy.gov/feg/calculatorCompareSideBySidePopUp.jsp?column=1&id=14757

e9999 said:
ethanol has about 2/3 of the energy content of gasoline per unit volume, IIRC. At the 10% (max?) level, that would be roughly a 3% decrease in mpg, everything else the same. So more like apples and 3% different apples... :)
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I do believe varying ethanol levels has a lot to do with MPGs people get across the country. I have no factual data, but I experienced about a 10% drop in MPGs in my cars when they started adding the ethanol years ago.
 
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