Uplander: why am I getting such poor gas Milage 13mpg?

I gave a 2008 Uplander 35000miles, but all I get is about 325 miles on a full tank. That is what I am getting with my Saturn 2002, with half the tank capacity. What could be causing such poor milage on a newer vehicle. We do 50/50 city / highway driving. Thanks.

oxygenated fuel is probably helping the lower mileage. It is rated 16 city and 23 hwy which these figures are usually never right anyways.

Has it always been like this, or is this a recent change?

If its always been this way, that's probably what its supposed to get. Have you divided the numbers to see what the mpg actually is?

If it has suddenly gotten worse, then either its the gas or there is something wrong with it. Is the check engine light on?