Here's my take on things:
Our GL is upset that the mpg's are not as posted. I understand. If you look at the performance of any of these hybrids there's quite a range. It's still early days on the 2007 Vue GL and the new model is on it's way, but I think the performance of the current model is emerging.

There are now 19 people posting results on GreenHybrid.com and the average MPG is 26.5. The 26.5 average is against the Vue GL's EPA ratings of 27 city and 32 highway. That means the average experience is 0.5 MPG less than the city rating. Some people that bought seem to have expected to get somewhere between 27 and 30 mpg. I did myself and I'm actually getting 24.4 at the moment. I have a 7 mile commute with 8-10 stops. After understanding my commute and the relative performance of this car I'm happy with it's peformance. I used to have a Grand Prix and got about 18mpg on the same path. I now have a better car for my family that gets much better mileage. As a celebrated American statesman once said, let's look at the record...(All of these average come from GreenHybrid.com)

Here's how the Vue GL compares to the competition in average perfomance vs. EPA city/highway ratings:
Vue GL 2WD Avg=26.5 vs. rating of 27/32 (0.5 below than lowest EPA rating)
Escape 2WD Avg=31.8 vs. rating of 36/31 (0.8 above lowest EPA rating)
Escape 4WD Avg=28.6 vs rating of 33/29 (0.4 below lowest EPA rating)
Lexus 400h Avg= 25.0 vs. rating of 31/27 (2.0 below lowest EPA rating)
Toyota HiHi 2WD=26.1 vs. rating of 33/28 (1.9 below lowest EPA rating)
Toyota HiHi 4WD=25.5 vs. rating of 31/27 (1.5 below lowest EPA rating)

There's just nothing to get upset about with the Vue GL. It's performing exactly like these other cars in relation to their EPA ratings. The mileage sweet spot (highway vs. city) is reversed, but the position in relationship to EPA ratings is the same. Only one of these hybrid SUV averages above either of it's EPA ratings. The Vue does better than the Lexus and Toyota models. Look at the Lexus performance where you pay about 50 grand and get 2 points under the EPA highway ratings! The issue is with the EPA way the ratings are done, not with the promises of any of these cars or manufacturers

My point is caveat emptor. I understand that if you're at the bottom of the curve you could be mad, but this is typical of any car model. Mileage varies with conditions.

If you want a cheap and attractive SUV that gets great mileage the Vue GL is an awesome choice. The Saturn Vue Hybrid does it's best work on the highway, so if your driving includes a lot of highway driving you should expect getting in the high 20's. A few people on GreenHybrid.com are even getting about 30mpg. If you do mainly city driving like me you will probably get around 23-25. If it's a mix it will be somewhere in between. I've driven my car through a cold winter and have seen my mileage creep up about 2.5 mpgs recently. If this holds for the next six months I may end up averaging 25-26 mpg which is very respectable.

Peace...