Remember, these numbers are ESTIMATES, not anything carved in stone. They are there to attempt to compare vehicles. As the saying goes: Close enough for government work.
Quirks in the system show up other places. The Saturn Vue Hybrid and Aura Hybrid have identical drivetrains. The EPA rates them both at 32 hwy, but the Vue (a small SUV) rates higher than the Aura in the city (25 vs 24).
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