When you were looking online you may have been looking at the MPG for the Suburban 2500 which has the 6.0 and worse gas mileage. The 1500 MPG is rated the same as the Tahoe.
One thing not mentioned before is that getting into the 3rd row with the Burb is a little easier due to the longer wheelbase because you don't have the wheel well hump at the second row doors.
One thing not mentioned before is that getting into the 3rd row with the Burb is a little easier due to the longer wheelbase because you don't have the wheel well hump at the second row doors.