The Pontiac G6 does 23.6 mpg combined (20.1 city, 29.8 highway), which works out to about $1,627 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 2.4L 4-cyl does 25 mpg while 3.5L 6-cyl does 22.5 — a difference of $171 a year. Against other V6 cars it sits above the average of 19.8 mpg.
Every Pontiac G6 engine, compared
Picking the right version of the same car often saves more fuel than picking a different car altogether. Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 2.4L 4-cyl | 21.4 / 31.4 | 2006–2010 | $1,536 | |
| 3.5L 6-cyl | 19 / 28.5 | 2005–2010 | $1,707 |
What that actually costs
Miles per gallon is an abstraction; the fuel bill is not. Here it is in money, at 12,000 miles a year and $3.20 a gallon.
| Measure | Value |
|---|---|
| Cost per mile | $0.136 |
| Fuel per year | $1,627 |
| Fuel over five years | $8,135 |
| Against other V6 cars | −$312 a year |
| EPA's own estimate | $2,545 a year |
City or highway — who is this car for
The gap between city and highway figures tells you whom the car suits. A wide gap punishes stop-and-start traffic; a narrow one means the car doesn't care where you drive it.
| Measure | Value | Reading |
|---|---|---|
| City | 20.1 mpg | $1,910 a year if you only drive in town |
| Highway | 29.8 mpg | $1,289 a year if you mostly commute |
| Gap | +9.7 mpg (48%) | Wide — this car dislikes traffic |
How the G6 changed over the years
Combined figure by model year. Jumps usually mark a new generation or a new engine; dips often mean a heavier body or added all-wheel drive.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2010 | 20.5 / 31 | 2 | $1,567 | |
| 2009 | 20.5 / 31 | 2 | $1,567 | |
| 2008 | 20 / 29.5 | 2 | $1,634 | |
| 2007 | 19 / 28 | 2 | $1,707 | |
| 2006 | 20.5 / 30 | 2 | $1,634 | |
| 2005 | 20 / 29 | 1 | $1,670 |
MPG is a number. Dollars per year is the answer.
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How we count
Fuel-economy figures come from EPA fueleconomy.gov — the same laboratory numbers printed on the window sticker. We don't adjust them; real-world consumption depends on how and where you drive.
What we add is money. Yearly cost assumes 12,000 miles at $3.20 a gallon — change either and the ranking stays, only the size of the bill moves. Cost per mile is the same figure divided out, useful when comparing a commute against a weekend car.
Frequently asked questions
What mpg does the Pontiac G6 get?
23.6 mpg combined on average — 20.1 in the city and 29.8 on the highway, per EPA ratings across 2005–2010.
How much does a Pontiac G6 cost in fuel per year?
About $1,627 at 12,000 miles and $3.20 a gallon — roughly $8,135 over five years, or 0.136 dollars a mile.
Which G6 engine is the most economical?
The 2.4L 4-cyl at 25 mpg, against 22.5 for the 3.5L 6-cyl — a difference of about $171 a year.
Is the G6 good on fuel compared with similar cars?
Against other V6 cars it sits above the average of 19.8 mpg, computed across 6170 ratings.
Are these real-world figures?
No — they are EPA laboratory ratings, the same ones on the window sticker. Real consumption depends on driving style, terrain, load and weather, and is typically a little worse.