Just had my first fill-up. 14 gal. for 280 mi. in OKC, city driving, frequent stop lights, mostly around 45 mph. Always tried to up-shift around 2500 rpm, only has about 500 miles, hasn't been driven over 70 mph. Some A/C lately, but mostly without A/C. Computer says 22.5mpg, which is wrong, either that or 7-eleven rig their pump. Funny thing is, after filling up, the 'range' thing says 263. Tires seem a little low, haven't checked 'em psi yet. Might try increasing tires press., see if they help me get to 28mpg like some of you guys.

Yah, so I don't own one yet, but both my bro and I are both considering.

Here's what I don't get.  I just drove up from Raleigh, NC to Boston, MA area.  In my 91 toy previa.  on the trip up, which included stop and go hiway, and at least 50-80 miles of rural routes/ with some stop lights, I got just an RCH under 26MPG.  This from a vehicle is bigger in every dimension, can carry 7 people in complete comfort, and that prolly weighs twice that the xB does, and has 210K miles on the odee, to boot.  It has AC (x2), PS, PW, PL. 

I kid and say I drive like a grampa, but i really don't... I do what every one else is doing, except i don't follow to closely.  and I keep my foot off the brake.  I averaged 63 MPH for the trip, including pit stops, and RI, CT, NY, NJ, MD, etc traffic and toll tie-ups and massive construction delays (WTF with the roads in the North East guys??? That's just embarrassing!). 

The van gets it's oil changed every 10K whether it needs it or not (it looks like honey when I finally change it)
and the plugs are original at least from 60k miles (which is when I bought it)

been up her for a week, mixed driving, stuck in construction (WTF???) and averaged just under 24.5MPG.

Anyone care to tell me how this is possible? 
I'd love to get a new car, but I can't justify it if this is the best they can do.  I can justify spending some money fixing my old egg.... especially if it gets what a new shoe-box on wheels gets. 
Come to think of it.... my 2000 trans am, with a 350HP 5.7 liter, 3800 lbs at the curb, an auto tranny and convertible fun, gets mid 20s on the highway too...  How come new cars get such incredibly crappy mileage???  I look at the xB and figger it should get mid thirties in a race.  what is goin on? 

I had a 90 Buick LeSabre that would get 33 mpg doing 70ish. I traded my 2002 Olds van that would get 30 mpg and hold 7 passengers for the xB, so, I am with you when it comes to the mpg that the xB is getting.  I believe that the xB should have an extra gear (automatics) to lower the rpms and that would be a big help.  I didn't purchase the xb for it's mileage alone, I just liked the car and wanted to downsize some. 

Auto makers will have to address the mpg issue very soon since gasoline is heading towards $10.00 a gallon quickly.

I guess you could call the xB, Back to the Future when it comes to mpgs! 

I saw somewhere online, the previa having a 3800 Lbs curb weight.  I'll put mine on a scale b4 the trip south. 

Edmunds says the 91 Previa weighs 3,780 lbs, the 2008 xB weighs 3086 lbs.  It also says the xB produces 20 more HP, and that the Previa's MPG was 18 city, 21 hwy (under the old measurement standards).

The position of the peddle is a much better indicator of fuel use.  That instant MPG thing is just a guess.

that is what i was thinking