An AWD model will almost always get worse mileage than its 2WD version. This happens for a few reasons. First off, it takes more work to turn four wheels than two, which puts a load on the engine and decreases mileage.
So, what about AWD systems that drive in 2WD mode until traction is needed, then send power to the other two wheels to find traction? These systems help mileage somewhat, but it still won’t be as good as a 2WD-only version because reduced fuel economy with AWD is due in part to the added weight of AWD components. An additional front or rear axle and center differential all add weight. On average, AWD will add around 100-300 pounds to a car’s curb weight.
The end result is that AWD models are typically rated with mileage around 1-4 mpg less than the 2WD model. Below are a few mileage examples of popular AWD models compared to their 2WD counterparts:
2008 Ford Taurus
Drive City/highway mpg
2WD 18/28
AWD 17/24
2008 Infiniti G35
Drive City/highway mpg
2WD 17/24
AWD 17/23
Chrysler Sebring (sedan)
Drive City/highway mpg
2WD 16/26
AWD 15/24
Volkswagen Passat (sedan)
Drive City/highway mpg
2WD 17/26
AWD 16/24
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