An Engineer's Ultimate Guide To 3.21 VS 3.92 Axle Ratio

[SnowBlaZR2]

That Eco Score app is sketchy at best.

This was my result after a short trip.
View attachment 132118
Sounds pretty good for a motor with only 300 miles on it EXCEPT my dash mpg average was only 18.6 mpg for the same trip.

 

[m.hamner]

I’m not sure I have the eco score app. Huh. Looked around in the vehicle apps and don’t see it.

 

[Dewey]

Funny thing is the Eco number was still climbing over 27 mpg when the live readout meter on the dash was steadily holding at about 15-18 mpg.

Either way I’m really happy so far on my first tank. Already getting better gas mileage than I did with my 4th Gen. Haven’t exactly been babying it either since I installed my G/T exhaust. Too much fun hearing that sweet exhaust note.

 

[nc_beagle]

I love the first time driving after a long tow of the camper. Start out with say 300 miles to empty then two hours later have 400 miles to empty. It's like free energy!

 

[c3k]

I know it's summertime in NC with daytime highs often hitting in the mid- to upper-90s. But, since I only have 3.21s, I've stopped using the air conditioning so I won't stall or bog. Sure, the wife complains about sweating through her clothing, but the other benefit is the increase in mileage. I think I went from ~26.5 combined to ~26.51 combined.

Not only is the engine freed of excessive accessory drag, but I'm saving literally thousands of dollars in fuel costs each month!

Win-win!

 

[SnowBlaZR2]

I know it's summertime in NC with daytime highs often hitting in the mid- to upper-90s. But, since I only have 3.21s, I've stopped using the air conditioning so I won't stall or bog. Sure, the wife complains about sweating through her clothing, but the other benefit is the increase in mileage. I think I went from ~26.5 combined to ~26.51 combined.

Not only is the engine freed of excessive accessory drag, but I'm saving literally thousands of dollars in fuel costs each month!

Win-win!

Here you go. Could probably even run the A/C intermittently.

 

[nc_beagle]

I know it's summertime in NC with daytime highs often hitting in the mid- to upper-90s. But, since I only have 3.21s, I've stopped using the air conditioning so I won't stall or bog. Sure, the wife complains about sweating through her clothing, but the other benefit is the increase in mileage. I think I went from ~26.5 combined to ~26.51 combined.

Not only is the engine freed of excessive accessory drag, but I'm saving literally thousands of dollars in fuel costs each month!

Win-win!

If you can go without your headlights, you eliminate all those photons pushing your truck back as they launch themselves forward to light up the road. That'll boost that mileage up even more!

 

[Dewey]

My first interstate commute at 35+ mpg.

Yeah right. LMAO

Dash read out was almost exactly half.


Needless to say that Eco-Coaching app is bogus.

 

[SnowBlaZR2]

My first interstate commute at 35+ mpg.

Yeah right. LMAO
View attachment 132157
Dash read out was almost exactly half.

View attachment 132158
Needless to say that Eco-Coaching app is bogus.

35.1 mpg. So close.

 

[djevox]

My first interstate commute at 35+ mpg.

Yeah right. LMAO
View attachment 132157
Dash read out was almost exactly half.

View attachment 132158
Needless to say that Eco-Coaching app is bogus.

Here’s some more crap that doesn’t make sense.

 

[Dewey]

35.1 mpg. So close.

It was still climbing when I stopped. Another 10 miles of driving and I would have been the new “Fuel Economy Champion”.

Better watch out….I’m gunnin’ for ya buddy.

 

[SnowBlaZR2]

It was still climbing when I stopped. Another 10 miles of driving and I would have been the new “Fuel Economy Champion”.

Better watch out….I’m gunnin’ for ya buddy.

Let's do this.

I'll be in Vegas in August and hear Mt. Charleston is great for downhill mpg.

 

[Dewey]

Here’s some more crap that doesn’t make sense.
View attachment 132165

View attachment 132166

I think it’s funny your eco score was so good with that mpg. Mine doesn’t even give a score. Maybe I’m not doing something right.

 

[Dewey]

Let's do this.

I'll be in Vegas in August and hear Mt. Charleston is great for downhill mpg.

If your running in 4 low with Hill Descent Control and 3.92’s I’ll likely beat you.

 

[BowDown]

My first interstate commute at 35+ mpg.

Yeah right. LMAO
View attachment 132157
Dash read out was almost exactly half.

View attachment 132158
Needless to say that Eco-Coaching app is bogus.

How's it coming up with thise numbers, is it calculating something different than fuel consumption?

 

[Dewey]

How's it coming up with thise numbers, is it calculating something different than fuel consumption?

No idea. It’s one of those mysteries I guess. All I know is it’s bogus.

The app is supposed to coach you to achieve good gas mileage. If I drove like they suggest I would buy a Prius. Screw it. After a day of that crap I’m ready to put the hammer down.

 

[ferraiolo1]

Yep. My older focus had the same app, the ditched in in the newer versions. As it never matched the actual mpg numbers.


Sent from my iPhone using Tapatalk

 

[Mountain Whiskey]

If you can go without your headlights, you eliminate all those photons pushing your truck back as they launch themselves forward to light up the road. That'll boost that mileage up even more!

With 3.21, every little bit helps!

 

[timman01]

Great explanation for those of us who aren't "gear heads", LOL!

 

[Mountain Whiskey]

Great explanation for those of us who aren't "gear heads", LOL!

Yes, it all breaks down to:
3.21 = girly/sissy with manbun
3.92 = man/truck

It really is easy.