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Comfort
Passengers in the back seat will be able to stretch out a lot more in the Mazda Mazda6 than the Kia Rio, due to its greater head- and legroom.
The Kia Rio will be a favorite with taller drivers due to its greater front head- and legroom than the Mazda Mazda6.
Convenience
With the Mazda Mazda6 you will definitely be making less frequent stops at the gas station than with the Kia Rio, due to its tank size and fuel economy.
Cost
There are a lot of factors to consider when calculating the overall cost of a vehicle. The main consideration is Manufacturer's Suggested Retail Price (MSRP). Based on MSRP, the Kia Rio is clearly a better financial choice over the Mazda Mazda6.
Another consideration is the Destination Charge, which is a standard charge for transporting the vehicle to the dealer from where it's built. The Kia Rio and the Mazda Mazda6 have similar Destination Charges.
Dimensions
Since the Kia Rio is much slimmer than the Mazda Mazda6, it'll be much easier to find a wide enough space in a crowded parking lot.
If you go with the Kia Rio, you'll have a much easier time finding a large enough space to park than you will with the Mazda Mazda6.
Drivetrain
The Kia Rio has much less torque than the Mazda Mazda6, which generally means that it won't feel as fast or powerful.
Handling
The Kia Rio has a significantly smaller turning radius than the Mazda Mazda6, allowing much better maneuverability in and out of tight spots.
Performance
When it comes to horsepower, the Kia Rio is significantly less powerful than the Mazda Mazda6. The good news is that, reportedly, cars with lower horsepower engines often have lower insurance premiums.
Utility
In terms of seating you'll be able to fit the same number of people in both the Kia Rio and the Mazda Mazda6.
The Kia Rio has less cargo capacity than the Mazda Mazda6, which is okay if you don't need to move a lot in one trip.
Warranty
You'll have greater peace of mind with the more generous basic warranty of the Kia Rio than that of the Mazda Mazda6.
Compare the 2015 Kia Rio and the 2015 Mazda Mazda6. 
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2015 Kia
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2015 Mazda
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| Cash Back Rebate: | Up to $500 | Visit Rebate Center |
| Low APR Loan: | As low as 0.90% | As low as 0.00% |
| Lease Incentive: | -- | As low as 0.02% |
| City MPG: | 27 | 25 - 26 |
| Highway MPG: | 37 | 37 - 38 |
| Engine(s): | Inline-4 | Inline-4 |
| Seating Capacity: | 5 - 5 | 5 - 5 |
| Basic Warranty: | 5 years/60,000 miles | 3 years/36,000 miles |
Overall Safety Rating 
Vehicle crash and safety data is provided by NHTSA, the National Highway Traffic Safety Administration. The NHTSA testing was established by Congress to reduce highway deaths and injuries. Read an article on the current NHTSA crash test program. |
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| Frontal Crash Rating
Vehicle crash and safety data is provided by NHTSA, the National Highway Traffic Safety Administration. The NHTSA testing was established by Congress to reduce highway deaths and injuries. Read an article on the current NHTSA crash test program. |
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| Side Crash Rating
Vehicle crash and safety data is provided by NHTSA, the National Highway Traffic Safety Administration. The NHTSA testing was established by Congress to reduce highway deaths and injuries. Read an article on the current NHTSA crash test program. |
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| Invoice*: | $13,732 - $17,167 | $20,235 - $28,235 |
Days on Lot measures the average number of days a model sits on a dealer's lot before it's sold. This is one predictor of a dealer's willingness to negotiate.
Monthly Trend for:
2015 Kia Rio
No Data
Monthly Trend for:
2015 Mazda Mazda6
No Data
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*MSRP and Invoice prices displayed do not include applicable gas taxes or destination charges.
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