GMC Sierra K15 vs Toyota Tundra
This page compares the GMC Sierra K15 and the Toyota Tundra across the 9 model years both appear in our data (2010–2018). Both are classed as Pickup on this site. On its most efficient configuration the GMC Sierra K15 averages about 22 mpg (UK) against 20 mpg for the Toyota Tundra. NHTSA lists fewer recall campaigns per model year for the GMC Sierra K15 (5.6 against 5.8), though campaign counts depend on how long each model has been on sale and how many variants share a campaign.
Head-to-Head: 2010–2018
| Measure | GMC Sierra K15 | Toyota Tundra |
|---|---|---|
| Average best-configuration economy (mpg, UK) | 22 | 20 |
| Average CO₂ (g/km) | 308 | 325 |
| Average estimated annual fuel cost (US EPA) | $3,728 | $3,950 |
| Model years rated 5★ overall by NHTSA | 5 of 8 | 0 of 8 |
| Average recall campaigns per model year | 5.6 | 5.8 |
| Average owner complaints per model year | 373 | 109 |
| Engine options across these years | 4 | 3 |
Year by Year
| Year | GMC Sierra K15 MPG (UK) | NHTSA | Recalls | Complaints | Toyota Tundra MPG (UK) | NHTSA | Recalls | Complaints |
|---|---|---|---|---|---|---|---|---|
| 2010 | 20 | — | 0 | 217 | 20 | — | 0 | 163 |
| 2011 | 20 | 4★ | 5 | 366 | 22 | 4★ | 11 | 134 |
| 2012 | 20 | 4★ | 3 | 152 | 22 | 4★ | 4 | 156 |
| 2013 | 20 | 4★ | 3 | 167 | 20 | 4★ | 6 | 85 |
| 2014 | 23 | 5★ | 9 | 859 | 20 | 4★ | 5 | 93 |
| 2015 | 23 | 5★ | 9 | 817 | 20 | 4★ | 5 | 49 |
| 2016 | 23 | 5★ | 8 | 49 | 20 | 4★ | 6 | 120 |
| 2017 | 23 | 5★ | 6 | 429 | 19 | 4★ | 6 | 78 |
| 2018 | 23 | 5★ | 7 | 304 | 19 | 4★ | 9 | 100 |
MPG is each model year's most efficient configuration (US EPA, converted to UK mpg). Recalls and complaints are NHTSA counts as of 6 October 2026; complaints are unverified owner reports and rise with sales volume. See each model's full history: GMC Sierra K15 · Toyota Tundra.
Frequently Asked Questions
Which is more fuel-efficient, the GMC Sierra K15 or the Toyota Tundra?
On its most efficient configuration the GMC Sierra K15 averages about 22 mpg (UK) against 20 mpg for the Toyota Tundra. Figures are the US EPA combined result converted to UK mpg, averaged over the shared model years; individual engines and years differ, so check the year pages for the exact car.
Which has better NHTSA safety ratings?
The GMC Sierra K15 has 5 of 8 model years rated 5★ overall in these years and the Toyota Tundra has 0 of 8. NHTSA ratings are only comparable between vehicles of similar size and weight, and the test criteria have changed over time.
Which has more recalls and owner complaints?
Per model year, the GMC Sierra K15 averages 5.6 recall campaigns and 373 owner complaints; the Toyota Tundra averages 5.8 and 109. Complaint counts are unverified owner reports and rise with sales volume, so use them as a pointer for what to inspect, not as a reliability ranking.
Where do these comparison figures come from?
Fuel economy, CO₂ and interior volume come from the US EPA's fueleconomy.gov data; ratings, recalls and complaints come from NHTSA. Only model years where both cars have data are compared.
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