Quote:
Originally Posted by chrisruns2far
The majority of the time you don't need all-wheel drive, which reduces the average fuel economy by 4-6 MPG.
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Here are some EPA figures for 2WD vehicles versus their AWD counterparts (same engine, same transmission):
2007 Infiniti G35 (RWD, 5-speed auto): 19/25
2007 Infiniti G35x (AWD, 5-speed auto): 18/25
EPA combined difference: 0.5 MPG
2008 Ford Taurus Limited FWD, 6-speed auto: 18/28
2008 Ford Taurus Limited AWD, 6-speed auto: 17/24
EPA combined difference: 3.5 MPG
2008 Ford Escape 4cyl FWD, 4-speed auto: 20/26
2008 Ford Escape 4cyl AWD, 4-speed auto: 19/24
EPA combined difference: 1.5 MPG
2008 Mazda Tribute V6, FWD, 4-speed auto: 18/24
2008 Mazda Tribute V6, AWD, 4-speed auto: 17/22
EPA combined difference: 1.5 MPG
2007 Porsche 911 Carrera 2, 6-speed manual: 18/26
2007 Porsche 911 Carrera 4, 6-speed manual: 18/26
EPA combined difference: 0 MPG
2008 Dodge Avenger R/T, FWD, 6-speed auto: 16/26
2008 Dodge Avenger R/T, AWD, 6-speed auto: 15/24
EPA combined difference: 1.5 MPG
2007 Chrysler 300C, RWD, 5-speed auto: 17/25
2007 Chrysler 300C, AWD, 5-speed auto: 17/24
EPA combined difference: 0.5 MPG
2007 Audi A4 2.0T, 6-speed manual: 23/34
20070 Audi A4 2.0T quattro, 6-speed manual: 22/31
EPA combined difference: 2 MPG
This isn't exactly an exhaustive search, but nonetheless they show that AWD does not reduce fuel economy by 4-6 MPG on average. The most egregious example I could find was 3.5 MPG, with the standard being around 1.5 MPG.