it sucks... around 15 miles per hour for street/highway combo...sometimes 16 MPH. i am appalled at how bad the gas mileage is........
Added: It will, of course, depend on your driving style, however I have an '04 six-cylinder and get about 22>24 mpg on the highway.
V6 - 22 mpg highway
The 2002 Toyota Highlander is a gas-powered vehicle.
The 2005 Toyota Highlander is a gas-powered vehicle.
The 2004 Toyota Highlander is a gas-powered vehicle.
The 2003 Toyota Highlander is a gas-powered vehicle.
The 2010 Toyota Highlander is a gas-powered vehicle.
The 2013 Toyota Highlander is a gas-powered vehicle.
The 2006 Toyota Highlander is a gas-powered vehicle.
The 2009 Toyota Highlander is a gas-powered vehicle.
The 2011 Toyota Highlander is a gas-powered vehicle.
The 2014 Toyota Highlander is a gas-powered vehicle.
The 2008 Toyota Highlander is a gas-powered vehicle.