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Mazda RX-8 vs. Porsche Boxster Fuel Economy (km/L)

Chart is based on 202 fuel economy reports for the Mazda RX-8 and 102 fuel economy reports for the Porsche Boxster.

Mazda RX-8 km/L

Mazda RX-8 Mazda RX-8 2010 40.2 MPG Highway Percentage 55 percent Mazda RX-8 Mazda RX-8 2009 41.2 MPG Highway Percentage 53 percent Mazda RX-8 Mazda RX-8 2008 49.1 MPG Highway Percentage 67 percent Mazda RX-8 Mazda RX-8 2007 41.4 MPG Highway Percentage 33 percent Mazda RX-8 Mazda RX-8 2007 52.9 MPG Highway Percentage 51 percent Mazda RX-8 Mazda RX-8 2006 41.9 MPG Highway Percentage 67 percent Mazda RX-8 Mazda RX-8 2006 40.7 MPG Highway Percentage 3 percent Mazda RX-8 Mazda RX-8 2005 40.7 MPG Highway Percentage 60 percent Mazda RX-8 Mazda RX-8 2004 31.0 MPG Highway Percentage 44 percent Mazda RX-8 Mazda RX-8 2004 40.7 MPG Highway Percentage 23 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
2010 4dr Coupe 232-horsepower 1.3L R2
6-speed manual RWD		 flat med light 1 22 22 55 74 40.2  
2009 4dr Coupe 232-horsepower 1.3L R2
6-speed manual RWD		 flat med none 2 16 29 53 68 41.2  
2008 4dr Coupe 232-horsepower 1.3L R2
6-speed manual RWD		 flat med light 3 16 15 67 72 49.1  
2007 4dr Coupe 232-horsepower 1.3L R2
6-speed manual RWD		 flat med none 5 14 48 33 79 41.4  
2007 4dr Coupe 212-horsepower 1.3L R2
6-speed shiftable automatic RWD		 flat med light 15 24 10 51 78 52.9  
2006 4dr Coupe 238-horsepower 1.3L R2
6-speed manual RWD		 flat med none 9 10 13 67 66 41.9  
2006 4dr Coupe 212-horsepower 1.3L R2
6-speed shiftable automatic RWD		 flat med light 5 28 65 3 60 40.7  
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2005 4dr Coupe 238-horsepower 1.3L R2
6-speed manual RWD		 flat med light 6 16 18 60 77 40.7  
2004 4dr Coupe 238-horsepower 1.3L R2
6-speed manual RWD		 flat med light 7 25 24 44 77 31.0  
2004 4dr Coupe 197-horsepower 1.3L R2
4-speed shiftable automatic RWD		 flat lead light 42 12 23 23 70 40.7  

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This page shows only averages. See all the Mazda RX-8 fuel economy data.

Porsche Boxster km/L

Porsche Boxster Porsche Boxster 2013 48.7 MPG Highway Percentage 80 percent Porsche Boxster Porsche Boxster 2011 37.6 MPG Highway Percentage 50 percent Porsche Boxster Porsche Boxster 2010 49.0 MPG Highway Percentage 38 percent Porsche Boxster Porsche Boxster 2010 82.0 MPG Highway Percentage 75 percent Porsche Boxster Porsche Boxster 2008 50.5 MPG Highway Percentage 27 percent Porsche Boxster Porsche Boxster 2008 27.8 MPG Highway Percentage 3 percent Porsche Boxster Porsche Boxster 2007 60.7 MPG Highway Percentage 80 percent Porsche Boxster Porsche Boxster 2007 37.6 MPG Highway Percentage 4 percent Porsche Boxster Porsche Boxster 2007 61.4 MPG Highway Percentage 55 percent Porsche Boxster Porsche Boxster 2006 50.4 MPG Highway Percentage 63 percent Porsche Boxster Porsche Boxster 2005 52.7 MPG Highway Percentage 48 percent Porsche Boxster Porsche Boxster 2005 38.6 MPG Highway Percentage 75 percent Porsche Boxster Porsche Boxster 2005 60.9 MPG Highway Percentage 70 percent Porsche Boxster Porsche Boxster 2005 60.2 MPG Highway Percentage 50 percent Porsche Boxster Porsche Boxster 2005 56.9 MPG Highway Percentage 43 percent Porsche Boxster Porsche Boxster 2004 48.6 MPG Highway Percentage 48 percent Porsche Boxster Porsche Boxster 2004 60.9 MPG Highway Percentage 80 percent Porsche Boxster Porsche Boxster 2004 49.4 MPG Highway Percentage 25 percent Porsche Boxster Porsche Boxster 2004 59.5 MPG Highway Percentage 47 percent Porsche Boxster Porsche Boxster 2003 51.6 MPG Highway Percentage 38 percent Porsche Boxster Porsche Boxster 2003 61.2 MPG Highway Percentage 50 percent Porsche Boxster Porsche Boxster 2003 65.9 MPG Highway Percentage 50 percent Porsche Boxster Porsche Boxster 2002 55.9 MPG Highway Percentage 47 percent Porsche Boxster Porsche Boxster 2002 12.5 MPG Highway Percentage 40 percent Porsche Boxster Porsche Boxster 2002 42.4 MPG Highway Percentage 51 percent Porsche Boxster Porsche Boxster 2002 55.2 MPG Highway Percentage 64 percent Porsche Boxster Porsche Boxster 2001 51.0 MPG Highway Percentage 52 percent Porsche Boxster Porsche Boxster 2001 53.8 MPG Highway Percentage 35 percent Porsche Boxster Porsche Boxster 2000 26.5 MPG Highway Percentage 55 percent Porsche Boxster Porsche Boxster 2000 68.2 MPG Highway Percentage 30 percent Porsche Boxster Porsche Boxster 2000 58.2 MPG Highway Percentage 34 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
2013 2dr Convertible 315-horsepower 3.4L H6
7-speed automated manual RWD		 flat med hvy 0 20 0 80 70 48.7  
2011 2dr Convertible 255-horsepower 2.9L H6
6-speed manual RWD		 flat med light 0 15 35 50 70 37.6  
2010 2dr Convertible 310-horsepower 3.4L H6
6-speed manual RWD		 flat med none 0 38 25 38 75 49.0  
2010 2dr Convertible 255-horsepower 2.9L H6
7-speed automated manual RWD		 hills med light 5 20 0 75 85 82.0  
2008 2dr Convertible 295-horsepower 3.4L H6
6-speed manual RWD		 flat med none 9 18 47 27 69 50.5  
2008 2dr Convertible 245-horsepower 2.7L H6
5-speed manual RWD		 flat med light 0 50 48 3 75 27.8  
2007 2dr Convertible 295-horsepower 3.4L H6
6-speed manual RWD		 flat med none 1 1 18 80 73 60.7  
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2007 2dr Convertible 245-horsepower 2.7L H6
5-speed shiftable automatic RWD		 flat med none 32 32 32 4 60 37.6  
2007 2dr Convertible 245-horsepower 2.7L H6
5-speed manual RWD		 flat med light 2 3 40 55 62 61.4  
2006 2dr Convertible 280-horsepower 3.2L H6
6-speed manual RWD		 flat lead light 6 11 22 63 65 50.4  
2005 2dr Convertible 280-horsepower 3.2L H6
6-speed manual RWD		 flat med light 9 11 32 48 69 52.7  
2005 2dr Convertible 280-horsepower 3.2L H6
5-speed shiftable automatic RWD		 flat lead hvy 0 25 0 75 80 38.6  
2005 2dr Convertible 240-horsepower 2.7L H6
6-speed manual RWD		 flat med none 10 10 10 70 65 60.9  
2005 2dr Convertible 240-horsepower 2.7L H6
5-speed shiftable automatic RWD		 flat light light 0 5 45 50 65 60.2  
2005 2dr Convertible 240-horsepower 2.7L H6
5-speed manual RWD		 hills med light 12 18 28 43 63 56.9  
2004 2dr Convertible 264-horsepower 3.2L H6
6-speed manual RWD		 flat med light 8 28 18 48 65 48.6  
2004 2dr Convertible 258-horsepower 3.2L H6
6-speed manual RWD		 flat med hvy 0 15 5 80 65 60.9  
2004 2dr Convertible 258-horsepower 3.2L H6
5-speed shiftable automatic RWD		 flat lead hvy 20 30 25 25 70 49.4  
2004 2dr Convertible 228-horsepower 2.7L H6
5-speed manual RWD		 hills med light 1 3 50 47 65 59.5  
2003 2dr Convertible 258-horsepower 3.2L H6
6-speed manual RWD		 hills med none 12 12 38 38 61 51.6  
2003 2dr Convertible 258-horsepower 3.2L H6
5-speed shiftable automatic RWD		 flat med light 0 50 0 50 70 61.2  
2003 2dr Convertible 228-horsepower 2.7L H6
5-speed manual RWD		 flat light none 25 0 25 50 60 65.9  
2002 2dr Convertible 250-horsepower 3.2L H6
6-speed manual RWD		 flat med light 15 15 24 47 65 55.9  
2002 2dr Convertible 250-horsepower 3.2L H6
5-speed shiftable automatic RWD		 flat light light 25 25 10 40 100 12.5  
2002 2dr Convertible 217-horsepower 2.7L H6
5-speed shiftable automatic RWD		 flat med light 10 29 10 51 70 42.4  
2002 2dr Convertible 217-horsepower 2.7L H6
5-speed manual RWD		 hills lead none 3 5 29 64 60 55.2  
2001 2dr Convertible 250-horsepower 3.2L H6
6-speed manual RWD		 hills lead light 13 22 13 52 68 51.0  
2001 2dr Convertible 217-horsepower 2.7L H6
5-speed manual RWD		 flat med none 15 15 35 35 70 53.8  
2000 2dr Convertible 250-horsepower 3.2L H6
6-speed manual RWD		 hills med light 5 17 23 55 93 26.5  
2000 2dr Convertible 217-horsepower 2.7L H6
5-speed shiftable automatic RWD		 flat med none 10 10 50 30 60 68.2  
2000 2dr Convertible 217-horsepower 2.7L H6
5-speed manual RWD		 flat med none 5 18 44 34 70 58.2  

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This page shows only averages. See all the Porsche Boxster fuel economy data.

Mazda RX-8 vs. Porsche Boxster 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 Mazda RX-8 and Porsche Boxster'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 Coupes
See TrueDelta's information for all Mazda models and Porsche models.

What Our Members Are Saying about the Real Gas Mileage of the Mazda RX-8

Mazda RX-8 Real Gas Mileage: Cons
YearBody/PowertrainComment
2009 4dr Coupe 232-horsepower 1.3L R2
6-speed manual RWD		 One of the big downsides of the rotary is truly horrendous fuel economy. When the RX-8 first came out in the early 2000s, its mileage ratings of 16/22 city/highway mpg (stick shift) were just barely acceptable, but there days, with many crossovers hitting more than 30 mpg on the highway, those figures are truly atrocious, especially given respectable but certainly not neck-snapping power. Futhermore, it takes premium. If you're using the RX-8 as it commuter, fuel costs will add up quickly. In my predominantly around-town driving, I typically average between 16-17 mpg. My highest recorded average was 20 mpg on a highway trip at speeds around 75 mph. see full Mazda RX-8 review
2007 4dr Coupe 212-horsepower 1.3L R2
6-speed shiftable automatic RWD		 The EPA numbers are way low compared with my real-world experience. The window sticker showed 18/25 and I have never seen less than 23 with my 40/60 city/highway commute. I think Mazda should develop a lean-burn economy cruise mode for this car. see full Mazda RX-8 review
2006 4dr Coupe 238-horsepower 1.3L R2
6-speed manual RWD		 Lite bit to high consumption when I drive it in normal speed. On full woot its ok. see full Mazda RX-8 review
2005 4dr Coupe 238-horsepower 1.3L R2
6-speed manual RWD		 Worst fuel economy in its class. see full Mazda RX-8 review
2004 4dr Coupe 238-horsepower 1.3L R2
6-speed manual RWD		 Not that bad for what it is, but it seems to me that Mazda's Sky Active technology could help the city mileage. It just needs more R&D. see full Mazda RX-8 review
2004 4dr Coupe 238-horsepower 1.3L R2
6-speed manual RWD		 At 16 m.p.g. on premium grade these days it could be cheaper to take a taxi. see full Mazda RX-8 review
2004 4dr Coupe 238-horsepower 1.3L R2
6-speed manual RWD		 For a small engine displacement and a relatively light vehicle weight, the gas mileage is weak. I usualy get around 19mpg, and that does not realy matter if I am doing all city or all highway driving. I think the real problem is in the sixth gear it isnt much different than fifth gear so it does not provide good fuel economy. see full Mazda RX-8 review
2004 4dr Coupe 238-horsepower 1.3L R2
6-speed manual RWD		 For a car with a 1.9 liter engine I would have expected better than 16-19 MPG. Get your foot into it and the numbers fall drastically. Otherwise I loved that car. It just got too small with a newborn and a big dog. see full Mazda RX-8 review
2004 4dr Coupe 238-horsepower 1.3L R2
6-speed manual RWD		 I gets 20MPG no matter what I do. Running around 20. 1/2 highway 20. All the highway all day 25-26. I think that it could do better. see full Mazda RX-8 review
2004 4dr Coupe 238-horsepower 1.3L R2
6-speed manual RWD		 16-18MPG city, 24MPG highway see full Mazda RX-8 review
 

What Our Members Are Saying about the Real Gas Mileage of the Porsche Boxster

Porsche Boxster Real Gas Mileage: Pros
YearBody/PowertrainComment
2002 2dr Convertible 217-horsepower 2.7L H6
5-speed shiftable automatic RWD		 mileage with performance see full Porsche Boxster review
2002 2dr Convertible 217-horsepower 2.7L H6
5-speed manual RWD		 Running the hills mostly safe speeds,and an occasional sprint or push through the corners I average 25 mpg/29 hwy.I think on a long boring drive possibly 32mpg see full Porsche Boxster review