What is normal rpm at highway speed 80mph? - Mazda CX3 Forum
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post #1 of 8 Old 04-29-2019, 10:48 AM Thread Starter
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What is normal rpm at highway speed 80mph?

I recently bought 2019 cx3. The rpm at highway speed 80mph is 3000rpm, flat surface. My 2019 cx5 maintains 2400~2500 rpm at the same speed. Is it normal?
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post #2 of 8 Old 04-29-2019, 12:14 PM
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Originally Posted by ynoh83 View Post
I recently bought 2019 cx3. The rpm at highway speed 80mph is 3000rpm, flat surface. My 2019 cx5 maintains 2400~2500 rpm at the same speed. Is it normal?
It's not easy answering without more information about your CX-3: is it with manual transmission or automatic for example?

My 120hp CX-3 with automatic transmission drives at about 46 km/h @1000rpm in 6th gear, which would be just under 2800rpm at 128kmh (80mph).

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post #3 of 8 Old 04-29-2019, 02:15 PM Thread Starter
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My Cx-3 is 6AT. I believe it's 3000rpm at 6th gear at 80mph.
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post #4 of 8 Old 04-30-2019, 05:55 AM
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Originally Posted by ynoh83 View Post
My Cx-3 is 6AT. I believe it's 3000rpm at 6th gear at 80mph.
That sounds about right.
What engine is in your CX-5?
If it's the 2.5, that might explain the lower rpm.

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post #5 of 8 Old 04-30-2019, 01:02 PM Thread Starter
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That sounds about right.
What engine is in your CX-5?
If it's the 2.5, that might explain the lower rpm.
Yes, it's 2.5
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post #6 of 8 Old 05-01-2019, 05:16 AM
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Originally Posted by ynoh83 View Post
Yes, it's 2.5
That could explain the lower rpm as the bigger engine would allow for a higher gearing.

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post #7 of 8 Old 05-01-2019, 11:42 AM
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Garage
Looks like the main difference is in the final drive ratio.

CX-3 (2.0L 6AT AWD) gear ratios:
Code:
First Gear Ratio (:1) :		3.55
Second Gear Ratio (:1) :	2.02
Third Gear Ratio (:1) :		1.45
Fourth Gear Ratio (:1) :	1.00
Fifth Gear Ratio (:1) :		0.71
Sixth Gear Ratio (:1) :		0.60
Reverse Ratio (:1) :		3.89
Final Drive Axle Ratio (:1) :	4.33
CX-5 (2.5L 6AT AWD) gear ratios:
Code:
First Gear Ratio (:1):		3.55
Second Gear Ratio (:1):		2.02
Third Gear Ratio (:1):		1.45
Fourth Gear Ratio (:1):		1.00
Fifth Gear Ratio (:1):		0.71
Sixth Gear Ratio (:1):		0.60
Reverse Ratio (:1):		3.89
Final Drive Axle Ratio (:1):	4.62


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post #8 of 8 Old 05-01-2019, 12:07 PM
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That combined with the respective wheels for the two models would explain the (small) difference in rpm at the same speed.

2015 Mazda CX-3 2.0 120HP Optimum Aut. Jet Black -with all the gadgets
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