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
The AMC Eagle and "Select Drive" revolutionized AWD cars all the way back in 1981.
The "profit motivated" automobile industry has done a marvelous job at convincing the public they need AWD or they are bound to get stuck at the first sign of poor weather.
For the performance fanatic AWD well help but for most the added cost isn't justified. Why, because FWD vehicles derive over 60% of their traction from the front wheels. Therefore anyone that drives in a reasonable manner will seldom if ever require more traction.
But some folks need that macho image regardless, which is why they still make V-8's.
Those folks that live in Buffalo, NY can ignore this message.
First off 'AWD' is a marketing term, not an engineering term.
'First off, it takes more work to turn four wheels than two'
That is non sense. You either drive those wheels directly via the drivetrain, the output of the center differential drives the front and rear differentials.
Or with an 'on demand' system, you drive one axle permanently, which drives the vehicle forward, which then induces the wheels and commensurate drivetrain to rotate.
Ford Taurus: there is a ride height difference [aerodynamics] which affects highway mileage, there is a curb weight difference which affects city mileage, there is a gearing difference which affects both 3.16 vs. 2.77. 14% is a bit much. [Ford should use 3.39 and 3.16]
G35: 200lbs of curb weight difference, plus at least 1/2 inch higher ride height
and you have to keep in mind that 17mpg could be anything within the 16.5-17.5mpg range.
Unless fuel economy ratings are going to be shown to the 0.5mpg.
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Why can't they put some switches on those AWD vehicles so that the driver can choose if they want AWD or not depending on the weather?