My parents gave me their 2000 SSEi for my 50th birthday. I've done a few mods to it, gutted air box, K&N filter, colder plugs, 180T-stat, Autolite 605 plugs, MSD Coils and wires, 3.5 Intense Racing supercharge pulley, Goerlich 608227 converter, 3" pipe, 2.5" dual Magnaflow 14324; replaced the bumper covers, headlights, taillights; and cleaned it up. I'm running 91 octane and I'm getting 25 to 28 MPG freeway. The car has 90K on it and is just getting broke in! This is my first Pontiac and I truly am impressed.