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2009 Infiniti G Gas Mileage (MPG)

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 G's real-world MPG based on how and where you drive a car.

2009 Infiniti G Gas Mileage (MPG):

Reported MPG

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If you are not a TrueDelta member, you can see only five Infiniti G MPG averages for each powertrain. Log in or join us to see them all.

Infiniti G Gas Mileage

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 MPG
2009 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic RWD
flat med hvy 20 40 0 40 75 21.3
  flat med light 10 10 15 65 60 25.8
  flat light hvy 0 75 0 25 65 22.1
  flat med none 5 20 20 55 75 26.0
  flat med none 10 15 10 65 70 21.0
2009 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic RWD
flat med light 9 32 9 50 69 23.2  
  Averages flat med light 9 32 9 50 69 23.2
With the 328-horsepower 3.7L V6 engine, 7-speed shiftable automatic transmission, and rear-wheel drive, 2009 Infiniti G fuel economy has been averaging 23.2 MPG (miles per gallon).

The 2009 Infiniti Gs in this analysis were driven mostly on the highway at an average speed of 69 miles per hour (about 50 percent of the miles driven). The rest of the miles were in the city (32 percent), in heavy traffic (9 percent), and in the suburbs (9 percent).

In addition the average 2009 Infiniti G in this analysis was driven on flat terrain with a medium foot and the AC on only some of the time.
 
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 MPG
2009 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic AWD
flat lead hvy 10 15 50 25 60 17.8
  flat med light 10 15 50 25 60 17.5
  flat med none 5 15 55 25 60 19.1
  flat med light 10 15 50 25 60 18.0
  flat light none 5 10 55 30 65 17.8
2009 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic AWD
flat med light 8 14 52 26 61 18.0  
  Averages flat med light 8 14 52 26 61 18.0
With the 328-horsepower 3.7L V6 engine, 7-speed shiftable automatic transmission, and all-wheel drive, the 2009 Infiniti G has been averaging 18.0 MPG (miles per gallon).

The 2009 Infiniti Gs in this analysis were driven mostly in the suburbs (about 52 percent of the miles driven). The rest of the miles were on the highway at an average speed of 61 miles per hour (26 percent), in the city (14 percent), and in heavy traffic (8 percent).

In addition the average 2009 Infiniti G in this analysis was driven on flat terrain with a medium foot and the AC on only some of the time.
 
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 MPG
2009 4dr Sedan 328-horsepower 3.7L V6
6-speed manual RWD
flat light light 0 9 0 91 70 24.5
2009 4dr Sedan 328-horsepower 3.7L V6
6-speed manual RWD
flat light light 0 9 0 91 70 24.5  
  Averages flat light light 0 9 0 91 70 24.5
With the 328-horsepower 3.7L V6 engine, 6-speed manual transmission, and rear-wheel drive, 2009 Infiniti G gas mileage has been averaging 24.5 MPG (miles per gallon).

The 2009 Infiniti Gs in this analysis were driven mostly on the highway at an average speed of 70 miles per hour (about 91 percent of the miles driven). The rest of the miles were in the city (9 percent), in heavy traffic (0 percent), and in the suburbs (0 percent).

In addition the average 2009 Infiniti G in this analysis was driven on flat terrain with a light foot and the AC on only some of the time.
 
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 MPG
2009 2dr Hardtop conv. 325-horsepower 3.7L V6
7-speed shiftable automatic RWD
flat med light 0 50 0 50 75 21.9
  flat lead hvy 25 25 25 25 75 20.0
  flat lead hvy 25 25 25 25 75 20.0
2009 2dr Hardtop conv. 325-horsepower 3.7L V6
7-speed shiftable automatic RWD
flat lead hvy 17 33 17 33 75 20.6  
  Averages flat lead hvy 17 33 17 33 75 20.6
With the 325-horsepower 3.7L V6 engine, 7-speed shiftable automatic transmission, and rear-wheel drive, 2009 Infiniti G fuel economy has been averaging 20.6 MPG (miles per gallon).

The 2009 Infiniti Gs in this analysis were driven mostly in the city (about 33 percent of the miles driven). The rest of the miles were on the highway at an average speed of 75 miles per hour (33 percent), in heavy traffic (17 percent), and in the suburbs (17 percent).

In addition the average 2009 Infiniti G in this analysis was driven on flat terrain with a lead foot and the AC on most or all of the time.
 
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 MPG
2009 2dr Hardtop conv. 325-horsepower 3.7L V6
6-speed manual RWD
flat lead none 10 10 70 10 70 15.0
2009 2dr Hardtop conv. 325-horsepower 3.7L V6
6-speed manual RWD
flat lead none 10 10 70 10 70 15.0  
  Averages flat lead none 10 10 70 10 70 15.0
With the 325-horsepower 3.7L V6 engine, 6-speed manual transmission, and rear-wheel drive, the 2009 Infiniti G has been averaging 15.0 MPG (miles per gallon).

The 2009 Infiniti Gs in this analysis were driven mostly in the suburbs (about 70 percent of the miles driven). The rest of the miles were in heavy traffic (10 percent), in the city (10 percent), and on the highway at an average speed of 70 miles per hour (10 percent).

In addition the average 2009 Infiniti G in this analysis was driven on flat terrain with a lead foot and the AC not used at all.
 
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 MPG
2009 2dr Coupe 330-horsepower 3.7L V6
7-speed shiftable automatic RWD
flat med light 20 10 20 50 75 17.2
  flat med none 5 5 20 70 75 20.0
  flat lead hvy 16 39 0 45 75 17.0
  flat med none 10 10 20 60 60 22.4
  flat med hvy 10 60 15 15 60 18.0
2009 2dr Coupe 330-horsepower 3.7L V6
7-speed shiftable automatic RWD
flat med light 12 25 15 48 69 18.9  
  Averages flat med light 12 25 15 48 69 18.9
With the 330-horsepower 3.7L V6 engine, 7-speed shiftable automatic transmission, and rear-wheel drive, 2009 Infiniti G gas mileage has been averaging 18.9 MPG (miles per gallon).

The 2009 Infiniti Gs in this analysis were driven mostly on the highway at an average speed of 69 miles per hour (about 48 percent of the miles driven). The rest of the miles were in the city (25 percent), in the suburbs (15 percent), and in heavy traffic (12 percent).

In addition the average 2009 Infiniti G in this analysis was driven on flat terrain with a medium foot and the AC on only some of the time.
 
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 MPG
2009 2dr Coupe 330-horsepower 3.7L V6
7-speed shiftable automatic AWD
flat light light 10 10 10 70 60 19.5
  flat light light 10 10 10 70 60 21.2
  flat light light 10 10 10 70 60 19.6
  flat light light 10 10 10 70 70 20.4
  flat med hvy 10 10 10 70 60 21.7
2009 2dr Coupe 330-horsepower 3.7L V6
7-speed shiftable automatic AWD
flat light light 10 10 10 70 62 20.5  
  Averages flat light light 10 10 10 70 62 20.5
With the 330-horsepower 3.7L V6 engine, 7-speed shiftable automatic transmission, and all-wheel drive, 2009 Infiniti G fuel economy has been averaging 20.5 MPG (miles per gallon).

The 2009 Infiniti Gs in this analysis were driven mostly on the highway at an average speed of 62 miles per hour (about 70 percent of the miles driven). The rest of the miles were in heavy traffic (10 percent), in the suburbs (10 percent), and in the city (10 percent).

In addition the average 2009 Infiniti G in this analysis was driven on flat terrain with a light foot and the AC on only some of the time.
 
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 MPG
2009 2dr Coupe 330-horsepower 3.7L V6
6-speed manual RWD
mtns med none 0 30 0 70 75 21.0
  hills light none 0 33 33 33 60 20.0
2009 2dr Coupe 330-horsepower 3.7L V6
6-speed manual RWD
mtns med none 0 32 17 52 68 20.5  
  Averages mtns med none 0 32 17 52 68 20.5
With the 330-horsepower 3.7L V6 engine, 6-speed manual transmission, and rear-wheel drive, the 2009 Infiniti G has been averaging 20.5 MPG (miles per gallon).

The 2009 Infiniti Gs in this analysis were driven mostly on the highway at an average speed of 68 miles per hour (about 52 percent of the miles driven). The rest of the miles were in the city (32 percent), in the suburbs (17 percent), and in heavy traffic (0 percent).

In addition the average 2009 Infiniti G in this analysis was driven on mountainous terrain with a medium foot and the AC not used at all.

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What Our Members Are Saying about the Real Gas Mileage of the 2009 Infiniti G

2009 Infiniti G Real Gas Mileage: Pros
YearBody/PowertrainComment
2009 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic RWD
A downside if you are used to more fuel efficient cars--you pay for performance. NOte that I had a 2005 Chrysler PT Cruiser turbo convertilble (4 cyl.) before I bought the G. It got worse gas mileage.
2009 Infiniti G Real Gas Mileage: Cons
YearBody/PowertrainComment
2010 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic AWD
To be honest, it is exactly what I expected, so no real beefs with it. That said, if you are looking for a car that gets better than 19 or so combined, this is not it. Decent freeway miles (24-27/g) but in city it is hard to beat 16/g.
2010 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic AWD
Fuel economy is poor - about 19 MPG average.
2009 2dr Coupe 330-horsepower 3.7L V6
7-speed shiftable automatic AWD
average 18 in town 24 highway.
2009 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic AWD
With such a large displaced engine and so much power you will find that you will have so-so mpg if you drive mainly in the city like I do. Especially if you are a "spirited" driver like I tend to be. I am averaging about 14-16mpg 95% city. On the highway its a different story. I have averaged up to 28mpg @ 78mph, I kind of wish I drove more on the highway.
2009 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic RWD
As noted before, the G will get about 18 around town in stop and go, about 27-28 on the highway.
2009 2dr Coupe 330-horsepower 3.7L V6
7-speed shiftable automatic RWD
You do not buy a performance car and expect to get good gas mileage. At a 5 mpg or greater difference from my last car, it is taking some getting used too.
2008 4dr Sedan 306-horsepower 3.5L V6
5-speed shiftable automatic AWD
Can live with it because of the performance, but wish the mileage was better and premium fuel was not required.
2008 4dr Sedan 306-horsepower 3.5L V6
6-speed manual RWD
While not terrible, ~20mpg is by no means phenomenal. Relatively comparable cars get ~23-27mpg, but typically also have smaller engines which explains a good portion of the difference.
2008 4dr Sedan 306-horsepower 3.5L V6
5-speed shiftable automatic AWD
Takes a lot of fuel... 14L/100km about.
2008 4dr Sedan 306-horsepower 3.5L V6
5-speed shiftable automatic RWD
Not too great. My average is 19 - 20 mpg, mostly city.