Ron Carter 5-Star Promise: We Deliver Cadillac Test Drives to Your Door, We Will Beat Any other New Cadillac Dealer offer by $1,000, We Will Buy Your Car for $500 More Than Anyone, Loaners for Owners Delivered to Your Door. See Ron Carter for details. The CT6 competes with full size luxury cars such as the BMW 7-series, the Audi A8 and the Mercedes-Benz S-Class.. Another amazing deal...jump on it quick. This car's sunroof is the perfect way to accent a road trip. This baby is going to fly off the lot at this price. Fill up less often! Thiis vehicle's EPA estimated fuel economy is a high 21 MPG combined. Features include: rear view camera, security system, a cabin air filtration system, extremely convenient cruise control and airbags. Offers to purchase may only be made following purchaser test drive. No dealers.