We are 107,000+ car owners sharing real-world car information.

Join Us

Infiniti G MPG

MPG Number of Vehicles
12 miles per gallon 1 vehicles
13 miles per gallon 0 vehicles
14 miles per gallon 0 vehicles
15 miles per gallon 0 vehicles
16 miles per gallon 2 vehicles
17 miles per gallon 2 vehicles
18 miles per gallon 6 vehicles
19 miles per gallon 3 vehicles
20 miles per gallon 9 vehicles
21 miles per gallon 5 vehicles
22 miles per gallon 3 vehicles
23 miles per gallon 3 vehicles
24 miles per gallon 3 vehicles
25 miles per gallon 2 vehicles
26 miles per gallon 1 vehicles
27 miles per gallon 1 vehicles
28 miles per gallon 0 vehicles
29 miles per gallon 0 vehicles
30 miles per gallon 0 vehicles
31 miles per gallon 1 vehicles
32 miles per gallon 1 vehicles
Model Year Body/Powertrain MPG  
2003 2003 4dr Sedan 330-hp 3.7L V6 7-sp shiftable automatic RWD 20.76
See all data
With the turbocharged 208hp 2.0L I4 engine, 7-speed shiftable automatic transmission, and rear-wheel drive, the 2003 Infiniti G has been averaging 20.76 MPG (miles per gallon).

The 2003 Infiniti Gs in this analysis were driven mostly on the highway at an average speed of 85 miles per hour (about 46.9 percent of the miles driven). The rest of the miles were in the city (15.3 percent), in heavy traffic (9.1 percent), and in the suburbs (0 percent).

In addition, the average 2003 Infiniti G in this analysis was driven on flat terrain with a medium foot and the AC on only some of the time.
2003 2003 4dr Sedan 260-hp 3.5L V6 6-sp manual RWD 24.49
See all data
2003 2003 2dr Coupe 330-hp 3.7L V6 6-sp manual RWD 18.1
See all data
2003 2003 2dr Coupe 330-hp 3.7L V6 7-sp shiftable automatic RWD 24.7
See all data
2003 2003 2dr Coupe 280-hp 3.5L V6 5-sp shiftable automatic RWD 20.97
See all data

Return to top

Was this information useful?

We're glad we could help! Share this page:

We're so sorry! Tell us how we can improve it.

See TrueDelta's information for all Infiniti models.

What Our Members Are Saying about the Real Gas Mileage of the 2003 Infiniti G

2003 Infiniti G Real Gas Mileage: Cons
YearBody/PowertrainComment
2004 4dr Sedan 260-horsepower 3.5L V6
5-speed shiftable automatic AWD
got between 14 and 17 mpg in the city see full Infiniti G review
2004 4dr Sedan 260-horsepower 3.5L V6
6-speed manual RWD
The G35 takes premium gas and from my research it looked like it would average about 10 mpg less than the Solara. see full Infiniti G review
2004 4dr Sedan 260-horsepower 3.5L V6
5-speed shiftable automatic AWD
16-17 city/24-25 highway see full Infiniti G review
2004 4dr Sedan 260-horsepower 3.5L V6
5-speed shiftable automatic RWD
Currently get 25-27 highway and 21=22.5 in the city. Live in extremely mountainous terrain, so mpg would be higher in a flat area such as Nebraska or Kansas. I would have added a 6th gear and kept the power. see full Infiniti G review
2004 2dr Coupe 280-horsepower 3.5L V6
5-speed shiftable automatic RWD
At the very best, my combined fuel economy never got above 20.4 MPG and is recenly under 19. see full Infiniti G review
2003 4dr Sedan 260-horsepower 3.5L V6
5-speed shiftable automatic RWD
City fuel economy is terrible. (15L/100km) Highway fuel economy is not as good either. (8L/100km @ 105km/hr) if going any faster, the fuel economy get worse! see full Infiniti G review
2003 4dr Sedan 260-horsepower 3.5L V6
5-speed shiftable automatic RWD
Very poor city mpg, almost as bad as large SUV. see full Infiniti G review
2003 4dr Sedan 260-horsepower 3.5L V6
5-speed shiftable automatic RWD
Highway fuel economy should be better, maybe higher fifth gear for lower revs at highway speeds. see full Infiniti G review
2003 2dr Coupe 280-horsepower 3.5L V6
5-speed shiftable automatic RWD
Freeway or city driving, AC or no AC, always average out to be around 20-21. No more no less. see full Infiniti G review
2003 2dr Coupe 280-horsepower 3.5L V6
6-speed manual RWD
Horrible fuel milage. Seems like they under-rated the horsepower and over rated the fuel economy. see full Infiniti G review
 

2003 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.