I bought my 2008 Silverado because of a job that I had and they would pay mileage. The job didnt work out and I am thinking about getting a HHR panel. I currently get 18 MPG with the truck 4.3 V6 auto mixed driving and 5K miles on it. The dealer says they could keep my payment close to what Ii am paying now. just need some advise on what to do. Thanks.