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Infiniti QX vs. Kia Optima Fuel Economy (km/L)

Chart is based on 7 fuel economy reports for the Infiniti QX and 152 fuel economy reports for the Kia Optima.

Infiniti QX km/L

Infiniti QX Infiniti QX 2008 32.1 MPG Highway Percentage 44 percent Infiniti QX Infiniti QX 2006 7.4 MPG Highway Percentage 43 percent Infiniti QX Infiniti QX 2005 15.3 MPG Highway Percentage 48 percent
Year Body/Powertrain flat, hilly, or mountainousLand driving style: very light to "lead foot"Foot A/C use: none to heavyA/C constant stop and goTraf % many stops per mileCity % stop every mile or twoSub % fairly steady speedHwy % Hwy Spd km/L
2008 4dr SUV 320-horsepower 5.6L V8
5-speed automatic 4WD w/low range
flat med light 7 15 34 44 63 32.1  
2006 4dr SUV 315-horsepower 5.6L V8
5-speed automatic 4WD w/low range
flat v.lt none 57 0 0 43 100 7.4  
2005 4dr SUV 315-horsepower 5.6L V8
5-speed automatic 4WD w/low range
flat light light 15 33 3 48 97 15.3  

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This page shows only averages. See all the Infiniti QX fuel economy data.

Kia Optima km/L

Kia Optima Kia Optima 2019 62.7 MPG Highway Percentage 40 percent Kia Optima Kia Optima 2017 123.7 MPG Highway Percentage 20 percent Kia Optima Kia Optima 2016 91.7 MPG Highway Percentage 80 percent Kia Optima Kia Optima 2013 60.0 MPG Highway Percentage 56 percent Kia Optima Kia Optima 2013 32.8 MPG Highway Percentage 54 percent Kia Optima Kia Optima 2013 25.3 MPG Highway Percentage 71 percent Kia Optima Kia Optima 2012 60.2 MPG Highway Percentage 39 percent Kia Optima Kia Optima 2012 76.0 MPG Highway Percentage 76 percent Kia Optima Kia Optima 2011 65.8 MPG Highway Percentage 68 percent Kia Optima Kia Optima 2011 67.6 MPG Highway Percentage 67 percent Kia Optima Kia Optima 2011 70.6 MPG Highway Percentage 75 percent Kia Optima Kia Optima 2010 47.0 MPG Highway Percentage 20 percent Kia Optima Kia Optima 2010 85.2 MPG Highway Percentage 80 percent Kia Optima Kia Optima 2009 68.4 MPG Highway Percentage 67 percent Kia Optima Kia Optima 2008 61.9 MPG Highway Percentage 10 percent Kia Optima Kia Optima 2008 61.6 MPG Highway Percentage 25 percent Kia Optima Kia Optima 2007 12.6 MPG Highway Percentage 78 percent Kia Optima Kia Optima 2007 54.7 MPG Highway Percentage 15 percent Kia Optima Kia Optima 2006.5 57.8 MPG Highway Percentage 58 percent Kia Optima Kia Optima 2006.5 67.9 MPG Highway Percentage 56 percent Kia Optima Kia Optima 2006.5 70.6 MPG Highway Percentage 90 percent Kia Optima Kia Optima 2005 28.5 MPG Highway Percentage 0 percent Kia Optima Kia Optima 2004 70.6 MPG Highway Percentage 95 percent
Year Body/Powertrain flat, hilly, or mountainousLand driving style: very light to "lead foot"Foot A/C use: none to heavyA/C constant stop and goTraf % many stops per mileCity % stop every mile or twoSub % fairly steady speedHwy % Hwy Spd km/L
2019 4dr Sedan turbocharged 245hp 2.0L I4
6-speed shiftable automatic FWD
flat med hvy 0 10 50 40 70 62.7  
2017 4dr Sedan 154-horsepower 2.0L I4 Hybrid
6-speed shiftable automatic FWD
flat light light 30 30 20 20 70 123.7  
2016 4dr Sedan turbocharged 178hp 1.6L I4
7-speed automated manual FWD
hills light light 6 0 14 80 67 91.7  
2013 4dr Sedan turbocharged 274hp 2.0L I4
6-speed shiftable automatic FWD
flat light light 0 24 21 56 69 60.0  
2013 4dr Sedan 200-horsepower 2.4L I4
6-speed shiftable automatic FWD
flat light none 0 32 14 54 83 32.8  
2013 4dr Sedan 159-horsepower 2.4L I4 Hybrid
6-speed shiftable automatic FWD
flat v.lt none 2 13 15 71 102 25.3  
2012 4dr Sedan turbocharged 274hp 2.0L I4
6-speed shiftable automatic FWD
hills light light 4 18 39 39 72 60.2  
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2012 4dr Sedan 200-horsepower 2.4L I4
6-speed shiftable automatic FWD
flat med none 0 4 20 76 69 76.0  
2011 4dr Sedan turbocharged 274hp 2.0L I4
6-speed shiftable automatic FWD
hills med light 0 5 28 68 70 65.8  
2011 4dr Sedan 200-horsepower 2.4L I4
6-speed shiftable automatic FWD
hills light none 4 7 21 67 66 67.6  
2011 4dr Sedan 200-horsepower 2.4L I4
6-speed manual FWD
flat med light 0 5 20 75 75 70.6  
2010 4dr Sedan 194-horsepower 2.7L V6
5-speed shiftable automatic FWD
flat med light 0 10 70 20 75 47.0  
2010 4dr Sedan 175-horsepower 2.4L I4
5-speed shiftable automatic FWD
flat light none 0 0 20 80 63 85.2  
2009 4dr Sedan 175-horsepower 2.4L I4
5-speed shiftable automatic FWD
flat light light 5 12 16 67 65 68.4  
2008 4dr Sedan 162-horsepower 2.4L I4
5-speed shiftable automatic FWD
flat light light 20 60 10 10 60 61.9  
2008 4dr Sedan 162-horsepower 2.4L I4
5-speed manual FWD
flat lead light 30 15 30 25 75 61.6  
2007 4dr Sedan 185-horsepower 2.7L V6
5-speed shiftable automatic FWD
flat med none 7 13 3 78 108 12.6  
2007 4dr Sedan 161-horsepower 2.4L I4
5-speed shiftable automatic FWD
hills med none 1 36 48 15 63 54.7  
2006.5 4dr Sedan 185-horsepower 2.7L V6
5-speed shiftable automatic FWD
flat light hvy 6 4 33 58 66 57.8  
2006.5 4dr Sedan 161-horsepower 2.4L I4
5-speed shiftable automatic FWD
flat light light 18 16 9 56 63 67.9  
2006.5 4dr Sedan 161-horsepower 2.4L I4
5-speed manual FWD
flat light hvy 0 0 10 90 60 70.6  
2005 4dr Sedan 170-horsepower 2.7L V6
4-speed shiftable automatic FWD
hills lead light 5 95 0 0 0 28.5  
2004 4dr Sedan 138-horsepower 2.4L I4
5-speed manual FWD
flat light hvy 0 0 5 95 70 70.6  

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This page shows only averages. See all the Kia Optima fuel economy data.

Infiniti QX vs. Kia Optima Fuel Economy (km/L)

Unlike other fuel economy surveys, TrueDelta's Real-World Gas Mileage Survey includes questions about how and where a car was driven. So you can get an idea of the Infiniti QX and Kia Optima's where a car was driven. So you can get an idea of their real-world km/L based on how and where you drive a car.

See TrueDelta's information for all Infiniti models and Kia models.

What Our Members Are Saying about the Real Gas Mileage of the Infiniti QX

Infiniti QX Real Gas Mileage: Cons
YearBody/PowertrainComment
2008 4dr SUV 320-horsepower 5.6L V8
5-speed automatic 4WD w/low range
It is what it is....we get 15 MPG on average (4wd). I can get 17 on the highway. see full Infiniti QX review
 

TrueDelta Reviews the Real Gas Mileage of the Kia Optima

Kia Optima Real Gas Mileage: Pros
YearComment
2013 Many auto makers are substituting turbocharged fours for V6s because of their theoretically superior fuel economy. The Kia Optima SXL earns EPA ratings of 22 mpg city, 34 highway. The similarly turbo-foured Ford Fusion comes close, 22/33. The most fuel efficient V6, in the new Honda Accord, manages 21/34 without paddle shifters, but 21/32 with them. Trip computer numbers suggest a one-to-two mpg advantage for the Kia in real-world suburban driving--perhaps too close to call since these devices aren't terribly precise. Figure just under 20 with a heavy foot, mid-20s if you resist the temptation, and just over 30 with a very light foot and luck with the lights. All of these figures are with the engine warmed up. In cold weather, fuel economy is in the mid-teens for the first mile or two. An eco mode makes little noticeable difference in either how the car drives or its fuel economy. These numbers don't seem particularly good? Recall that the Kia Optima SXL is a very quick car. You won't find a 274-horsepower sedan that does better without the aid of a battery pack. see full Kia Optima review
 

What Our Members Are Saying about the Real Gas Mileage of the Kia Optima

Kia Optima Real Gas Mileage: Pros
YearBody/PowertrainComment
2013 4dr Sedan turbocharged 274hp 2.0L I4
6-speed shiftable automatic FWD
I find fuel economy, in mixed driving, to be on par with a V6 of comparable power. I usually get about 24 MPG in combined driving. However, on a recent road trip, I had 32 MPG on one tank. It's perhaps slightly better than the Acura TL I had, but one big bonus: the Acura required premium unleaded. On the Kia Optima, however, the manufacturer only calls for regular unleaded. Over time, that can mean a significant savings. see full Kia Optima review
2012 4dr Sedan turbocharged 274hp 2.0L I4
6-speed shiftable automatic FWD
This is my biggest (and only real) complaint with the Optima. It advertises fuel economy of 22 city, 34 highway. I drive a lot (100 mile round trip daily, with more than half of it being highway miles). Admittedly, I have a heavy foot, but I regularly get about 24-25 mpg combined, with the car in ECO mode. The best tank of gas I ever got was a little over 28 mpg. (I calculate it manually, don't rely on the on-board MPG estimates, as they are always 3-5 MPG more generous than reality.) see full Kia Optima review
2011 4dr Sedan 200-horsepower 2.4L I4
6-speed shiftable automatic FWD
High 30s on the highway and 29-30 overall with a lot of power. Active eco. setting for better economy. see full Kia Optima review
2011 4dr Sedan turbocharged 274hp 2.0L I4
6-speed shiftable automatic FWD
33 mpg on 200 mile trips at about 65 mph avg. see full Kia Optima review
2008 4dr Sedan 162-horsepower 2.4L I4
5-speed manual FWD
Decent fuel mileage at this point for a mid-size sedan. see full Kia Optima review
2007 4dr Sedan 161-horsepower 2.4L I4
5-speed shiftable automatic FWD
25-30 city/hwy see full Kia Optima review
2007 4dr Sedan 161-horsepower 2.4L I4
5-speed shiftable automatic FWD
It may be a bit borderline in 100% city driving (19-20 mpg), but it gets 33mpg+ on the open highway, with only a 1-2 mpg penalty for using A/C. see full Kia Optima review
2007 4dr Sedan 161-horsepower 2.4L I4
5-speed shiftable automatic FWD
got 42 mgh yesteerday on a 120 minute drive 25%/75% in town/highway driving. Like paying $2.25 per gallon, see full Kia Optima review
2005 4dr Sedan 170-horsepower 2.7L V6
4-speed shiftable automatic FWD
AS above see full Kia Optima review
Kia Optima Real Gas Mileage: Cons
YearBody/PowertrainComment
2012 4dr Sedan turbocharged 274hp 2.0L I4
6-speed shiftable automatic FWD
I'd recommend this car in a heartbeat. I honestly like this styling even more than the updates they've made since 2012. My biggest cons are the fuel economy and the lack of a manual transmission on any models other than the base model. see full Kia Optima review