Against 335 other V8 cars rated 2004–2006, the Q45 beats their 15.6 mpg average by 2.4 mpg, about $329 a year. Averaged over the years each was sold, the most economical engine since 1990, the 4.1L 8-cyl (1997–2001), does 18 mpg and the thirstiest, the 4.5L 8-cyl (1990–2006), 17.4: $74 a year apart.
Every Infiniti Q45 engine, compared
Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 4.1L 8-cyl | 16 / 21.6 | 1997–2001 | $2,133 | |
| 4.5L 8-cyl | 15.4 / 20.9 | 1990–2006 | $2,207 |
What that actually costs
Against its rivals in the same model years, the Hyundai Elantra gets 26.7 mpg, the Nissan Altima 24.6 mpg and the Acura TL 21 mpg, next to 18 mpg for the 2006 Q45. The Q45 costs the most of them to run: $695 a year more than the Hyundai Elantra.
| Measure | Value |
|---|---|
| Cost per mile (2006) | $0.178 |
| Fuel per year | $2,133 |
| Fuel over five years | $10,665 |
| Against other V8 cars, 2004–2006 | −$329 a year |
| EPA's own estimate | $4,403 a year |
City or highway — who is this car for
The 2006 Infiniti Q45 gives up 6 mpg in town: 22 on the highway against 16 in the city, $655 a year if every mile were city driving.
| Measure | Value | Reading |
|---|---|---|
| City (2006) | 16 mpg | $2,400 a year if you only drive in town |
| Highway | 22 mpg | $1,745 a year if you mostly commute |
| Gap | +6 mpg (38%) | Wide — this car dislikes traffic |
How the Q45 changed over the years
The Q45 peaked in 2006 at 18 mpg (16 city, 22 highway) and was at its thirstiest in 1996 at 17 — 1 mpg apart, or $126 a year in fuel between buying one year and the other.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2006 | 16 / 22 | 1 | $2,133 | |
| 2005 | 16 / 22 | 1 | $2,133 | |
| 2004 | 16 / 22 | 1 | $2,133 | |
| 2003 | 16 / 22 | 1 | $2,133 | |
| 2002 | 16 / 23 | 1 | $2,133 | |
| 2001 | 16 / 21 | 1 | $2,133 | |
| 2000 | 16 / 21 | 1 | $2,133 | |
| 1999 | 16 / 22 | 1 | $2,133 | |
| 1998 | 16 / 22 | 1 | $2,133 | |
| 1997 | 16 / 22 | 1 | $2,133 | |
| 1996 | 15 / 20 | 1 | $2,259 | |
| 1995 | 15 / 20 | 1 | $2,259 | |
| 1994 | 15 / 20 | 1 | $2,259 | |
| 1993 | 15 / 20 | 1 | $2,259 | |
| 1992 | 15 / 20 | 1 | $2,259 | |
| 1991 | 15 / 20 | 1 | $2,259 | |
| 1990 | 15 / 20 | 1 | $2,259 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 17 EPA ratings of the Infiniti Q45 — 2 engines across 1990–2006. The mileage is EPA's laboratory figure, unchanged; the yearly bill is ours, at 12,000 miles and $3.20 a gallon, against EPA's own estimate of $4,403. Full method.
Frequently asked questions
What mpg does the 2006 Infiniti Q45 get?
18 mpg combined, 16 city and 22 highway, per EPA. Across every year since 1990 the Q45 has averaged 17.6 mpg.
Is the 2006 Q45 more efficient than the 2005?
About the same: 18 against 18 mpg combined.
Which Q45 year has the best gas mileage?
The 2006, at 18 mpg combined (16 city, 22 highway), which is also the latest model year we hold.
Does the Q45 get better gas mileage than the Hyundai Elantra?
No: 18 mpg for the 2006 Q45 against 26.7 for the 2007 Hyundai Elantra, about $695 a year more to run.
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