general problems of the 2008 Buick Lucerne

I purchased an 08 Buick Lucerne in sept. Of 08. My concern deals with the accelerator. This model I am told has an all electronically controlled accelerator. I find it almost impossible to hold an even speed on the highway as it is constantly either speeding up or slowing down, and I have no perception of ever moving the pedal. At stop signs/lights it will sometimes leap out with a "jack rabbit" start which was totally unplanned for. This I feel is a major safety issue plus I also think it has a lot to do with the poor mileage I am experiencing. I am only getting 15-23 mpg which is far from the 23-29 I got on my 05 lasabre with the same engine. I have had it to two dealerships and they basically tell me this is all electronic and there is nothing they can do. I find this answer unacceptable and hope that you can possibly help. Thank you.

The contact owns a 2008 Buick Lucerne. The contact stated when refueling the vehicle, gasoline would spew back out from the filler tube and onto the contact. The dealer advised that the vehicle was repaired but the failure persisted. In addition, the front driver window was abnormally slow in opening and would squeak. The driver seat has no padding and when exiting the vehicle, she would have to tilt the steering wheel upward in order to exit. The vehicle was not repaired. The failure and current mileage was 19,950. Updated 12/7/10 the consumer also stated the traction light illuminated and the door locks had to repaired. Updated evoq 03/01/11.