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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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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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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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