2012 Infiniti G37 MPG & Specs — Real-World vs EPA, All Trims
Every gas trim of this model takes premium.
Is the 2012 Infiniti G37 good on gas?
At up to 22 MPG combined, the 2012 Infiniti G37 is about average for a Midsize Cars — that class averages about 23.0 MPG across 5,710 EPA-tested versions, so it's middle-of-the-road for its size.
Real-world MPG vs the EPA number
The EPA figures above come from a standardized dynamometer test, not the open road — real-world MPG typically runs a bit lower depending on your driving, climate and terrain. That's true of every car on this site, old or new.
EPA updated its fuel-economy equations again for model year 2017 — mostly affecting hybrids and turbocharged engines — and recalculated 2011-2016 ratings to match, in some cases 1-2 MPG lower. The number above already reflects that update.
At today's AAA national average price — $4.68/gal for premium gas as of 2026-07-05 — the most efficient trim runs about $3,191/year (roughly $266/month, about $21.27 per 100 miles) at the EPA's assumed 15,000 miles/year, using an estimated 682 gallons a year. We don't estimate a cost-per-fill since exact tank size isn't in the public EPA dataset, but the per-100-mile figure scales to any tank. Current national average gas prices →
2012 Infiniti G37 trims & fuel economy
| Trim (engine / transmission) | Fuel | MPG | Fuel/yr (today's price) |
|---|---|---|---|
| 3.7L 6-cyl, S7 automatic, RWD | PREMIUM | 22 | $3,191 |
| 3.7L 6-cyl, 6-spd manual, RWD | PREMIUM | 19 | $3,695 |
2012 Infiniti G37 specs
What the EPA test-car listings record for this model year — every combination sold is a row in the trims table above.
| Engine options | 3.7L 6-cyl |
| Transmission | S7 automatic · 6-spd manual |
| Drive type | RWD |
| EPA body class | Midsize Cars |
| Fuel | Premium |
Other years of the Infiniti G37
Similar cars (Midsize Cars)
Cars that take premium · Cheapest cars to fuel · Where fuel grade depends on the trim · Fuel guides
2 trim(s) · EPA FuelEconomy.gov data retrieved 2026-07-24 · fuel prices AAA national average as of 2026-07-05.