Against 469 other V6 cars rated 2007–2009, the G8 sits right on their 19.5 mpg average. Averaged over the years each was sold, the most economical engine since 2008, the 3.6L 6-cyl (2008–2009), does 20 mpg and the thirstiest, the 6L 8-cyl (2008–2009), 18: $213 a year apart.
Every Pontiac G8 engine, compared
Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 3.6L 6-cyl | 17 / 25 | 2008–2009 | $1,920 | |
| 6L 8-cyl | 15 / 24 | 2008–2009 | $2,133 |
What that actually costs
Against its rivals in the same model years, the Chrysler 300 gets 19.8 mpg, the Hyundai Sonata 23.5 mpg and the Chevrolet Impala 21 mpg, next to 19 mpg for the 2009 G8. The G8 costs the most of them to run: $387 a year more than the Hyundai Sonata.
| Measure | Value |
|---|---|
| Cost per mile (2009) | $0.168 |
| Fuel per year | $2,021 |
| Fuel over five years | $10,105 |
| Against other V6 cars, 2007–2009 | +$52 a year |
| EPA's own estimate | $3,488 a year |
City or highway — who is this car for
The 2009 Pontiac G8 gives up 8.5 mpg in town: 24.5 on the highway against 16 in the city, $833 a year if every mile were city driving.
| Measure | Value | Reading |
|---|---|---|
| City (2009) | 16 mpg | $2,400 a year if you only drive in town |
| Highway | 24.5 mpg | $1,567 a year if you mostly commute |
| Gap | +8.5 mpg (53%) | Wide — this car dislikes traffic |
How the G8 changed over the years
Combined figure across the 2 model years the G8 was rated in, all of them at 19 mpg.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2009 | 16 / 24.5 | 2 | $2,021 | |
| 2008 | 16 / 24.5 | 2 | $2,021 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 4 EPA ratings of the Pontiac G8 — 2 engines across 2008–2009. 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 $3,488. Full method.
Frequently asked questions
What mpg does the 2009 Pontiac G8 get?
19 mpg combined, 16 city and 24.5 highway, per EPA; its 2 versions that year range from 18 to 20. Across every year since 2008 the G8 has averaged 19 mpg.
Is the 2009 G8 more efficient than the 2008?
About the same: 19 against 19 mpg combined.
Does the G8 get better gas mileage than the Chrysler 300?
About the same: 19 mpg for the 2009 G8 against 19.8 for the 2010 Chrysler 300.
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