According to Edmunds
There are 7 models that get an EPA 25 - 30 Highway and 2 that get an EPA 20 - 25 Highway.
But as with all car's it depends on the weight of your right foot. :-)
See Link.
Hope this answers you Question.
Bill Greene
Capacity is 25 Gallons
There are two types of 2006 Chevrolet HHRs: LS and LT. The 2006 Chevrolet HHR LS Wagon has a 2.2L motor. The 2006 Chevrolet HHR LT Wagon has a 2.2L motor.
The EPA mileage estimate for the 2006 Chevrolet Malibu is 20 mpg in the city, 29 mpg on the highway.
The EPA mileage estimate for the 2006 Chevrolet Impala is 18 mpg in the city, 28 mpg on the highway.
The EPA mileage estimate for the 2006 Chevrolet Suburban is 13 mpg in the city, 17 mpg on the highway.
The EPA mileage estimate for the 2006 Chevrolet Corvette is 16 mpg in the city, 26 mpg on the highway.
The EPA mileage estimate for the 2006 Chevrolet Express is 13 mpg in the city, 18 mpg on the highway.
The EPA mileage estimate for the 2006 Chevrolet Equinox is 17 mpg in the city, 22 mpg on the highway.
The EPA mileage estimate for the 2006 Chevrolet Colorado is 18 mpg in the city, 25 mpg on the highway.
The EPA mileage estimate for the 2006 Chevrolet Tahoe is 14 mpg in the city, 19 mpg on the highway.
If you need to locate and Replace Chevrolet Uplander cabin air filter from year 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 you need to follow some steps. To change cabin air filter on Chevrolet Uplander first time you need to open the glove box and then you need to remove the plastic panel (see picture).