Ummm actually Chevrolet and pretty much every car review site classifies the SS as a performance car. The SS and Corvette are two totally different vehicles, and it doesn't surprise me that a 2 door all out sports car that happens to be the pride and joy of the GM Performance Division that is lighter and more powerful than the SS could smoke it. The SS gets 21/14 MPG which is right around the cars it actually competes with, the Suburban gets 21/15 MPG so yes it's 1 MPG better in the city, but the reason to that is the 5.3L Vortec uses Active Fuel Management Cylinder Deactivation, something the SS isn't equipped with.Wikied the Caddy XTS
Class
Full-size luxury sedan
Body style
4-door sedan
Layout
Transverse front-engine, front-wheel drive / all-wheel drive
Platform
GM Epsilon II
Related
Chevrolet Impala (Tenth Generation)
Buick LaCrosse (Second Generation)
Saab 9-5 (Second Generation)
The SS is just the Pontiac GTO with a few extra cubes. Doesn't have direct injection, doesn't have VVT, doesn't have AFM, does have a gas guzzler tax, has a LOWER average fuel economy than a freakin' Suburban... I was really interested in an SS as a replacement for my LS, until I found all this out. Still hoping they will fix this problem before lack of sales kills it because I'd like to get one but will NOT buy a car that gets worse mileage than a Suburban. And nobody say it's a performance car either, the Corvette will smoke the SS like a cheap cigar and gets 30MPG when driven nicely. At least they didn't hang the SS with a 4 speed trans, it comes with a 6 speed auto. No manual, just a 6 speed auto, and it's not like they don't have the Camaro SS 6 speed manual available to them.
http://www.chevrolet.com/ss-sports-sedan.html