3.21 vs 3.92: The Last Word

[djevox]

If people are going to throw around numbers, at least show how they were achieved. Here’s an example:

 

[SnowBlaZR2]

 

[StuartV]

View attachment 130330

I WISH I could look forward to a fuel cost of $2.75/gallon when I get my next truck (which I'm hoping to be soon).

 

[SnowBlaZR2]

I WISH I could look forward to a fuel cost of $2.75/gallon when I get my next truck (which I'm hoping to be soon).

Yeah, but not knowing what fuel costs will be, figured it would be more useful to look back at what you might have seen with a different rear end in your current truck.

Assuming $5/gallon for the next three years, and no other variable changes:

 

[ferraiolo1]

So $80 a month saved. That’s with 2mpg difference. Which we all know is more like 4-5 on a highway at speeds.

 

[SnowBlaZR2]

Also it’s a bit more than 2mpg

No, it isn't. You're lucky I'm giving you 2 mpg instead of 1 with your 21.5 mpg.

 

[SnowBlaZR2]

National averages, assuming that $5/gallon becomes the norm, and living in @ferraiolo1 fantasy land:

 

[ferraiolo1]

I’ve shown my fantasy land average over a long period of combined driving.

That kinda makes it the real world.


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[SnowBlaZR2]

 

[ferraiolo1]

All the mpgs when you’re engines turned off sitting in traffic.

I’d get 50mpg average if I did that!


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[djevox]

View attachment 130347

 

[SnowBlaZR2]

View attachment 130350

 

[Idahoktm]

Here are numbers that are specific to me. Driving 95% city, 3.21 gears will not yield a mpg advantage but I know how sensitive the 3.21 crowd can be, so I gave them a 1 mpg advantage.

 

[nc_beagle]

All arguments aside, I think my 3.92 did come in handy pulling a stump out of the ground at lunch We had a 20' Emerald Green Arborvitae taking over some front windows so I cut it down to about 3', wrapped tow straps around it and eased it out. Now, if my wife asks anyone, it was squirrels that tore up the bushes between me and said stump....

 

[BowDown]

National averages, assuming that $5/gallon becomes the norm, and living in @ferraiolo1 fantasy land:

View attachment 130346

No, it isn't. You're lucky I'm giving you 2 mpg instead of 1 with your 21.5 mpg.

I easily get 22.x-23 on the highway at 74 and 72 mph. I average high 17-18 mixed driving 70/30 city/highway

 

[BowDown]

Here are numbers that are specific to me. Driving 95% city, 3.21 gears will not yield a mpg advantage but I know how sensitive the 3.21 crowd can be, so I gave them a 1 mpg advantage.
View attachment 130355 View attachment 130356

3.21 mixed city driving




I get roughly the same every week, 420-430 miles per tank (26 gal refilling with 23 gal). No sensitivity here, it is what it is

 

[SnowBlaZR2]

 

[BowDown]

View attachment 130410

but at what speed and over how many miles? IIRC your 20 mpg pic was based off 49 mph whereas mine 21.5 was based off 73 mph and we all know the trickery in the above pic




That's an average speed of 72mph driving Dallas through Houston (at 9AM), not 49mph or a quick reset of the fuel mileage screen while driving slow.
Prior to getting into Houston during morning rush hour, I was at 22.x




Here's a full tank average, mixed city and highway in North Dallas, avg speed is 39 mph over 435 miles

 

[Dewey]

View attachment 130410

I heard your truck was one of the rare prototypes that was accidentally released from the factory with 2.29 gears but was mistakenly listed as 3.92’s.

 

[StuartV]

All arguments aside, I think my 3.92 did come in handy pulling a stump out of the ground at lunch We had a 20' Emerald Green Arborvitae taking over some front windows so I cut it down to about 3', wrapped tow straps around it and eased it out. Now, if my wife asks anyone, it was squirrels that tore up the bushes between me and said stump....

4 Lo and I don't think it would have mattered what rear end you had...