Cars.com Features:

• Auto Shows: Find out which vehicles may make their way into showrooms in the future, and delight at the strange array of concept vehicles.

• Best and Worst MPG: Find out how the gas mileage of 2004 models compares, and see which ones are the most and least fuel efficient.

• Residual Values: Some vehicles hold their value better than others. Find out what 2004 models are estimated to be worth the most — and least — after three years.

• Top-Selling Manufacturers: With new numbers posted every month, find out which 10 manufacturers are the current sales leaders.

• Vehicle Profiles: Read in-depth reviews of today’s hottest models.

Aftermarket Accessory Companies:

• Aerogear, 249 W. Jackson St., #255, Hayward, CA 94544; 888/215-9375.

• American Products Co., 22324 Temescal Canyon Road, Corona, CA 92883; 800/594-4272; fax: 909/898-9820.

• Andy’s Auto Sport, 1666 S. Main St., Suite A, Milpitas, CA 95035; 800/419-1152; fax: 408/263-9526.

• B&M Racing & Performance Products, 9142 Independence Ave., Chatsworth, CA 91311; 818/882-6422.

• Big Boyz Toys, 12228 N. 51st Ave., Glendale, AZ 85304; 602/548-6529.

• Borla Performance Industries, 5901 Edison Drive, Oxnard, CA 93033; 877/462-6752.

• DG Motorsports, 3225-A Production Ave., Oceanside, CA 92054; 760/433-7413; fax: 760/433-3838.

• The Driver’s Image, 8242 N. McCormick Blvd., Skokie, IL 60076; 847/568-5555; fax: 847/568-9181.

• Flowmaster Inc., 100 Stony Point Road, Suite 125, Santa Rosa, CA 95401; 800/544-4761; fax: 707/544-4784.

• Green Filter USA, P.O. Box 149, 714 Braddock View Drive, Mt. Braddock, PA 15465; 724/430-2050; fax: 724/437-0705.

• Hypertech Inc., 3215 Appling Road, Bartlett, TN 38133; 901/382-8888.

• K&N Performance Filters, K&N Engineering Inc., P.O. Box 1329, 1455 Citrus Ave., Riverside, CA 92502; 800/858-3333.

• Mach V Motorsports, 136 W. Jefferson St., Falls Church, VA 22046; 703/237-0900; fax: 703/237-1707.

• Modern Image, 17141 Palmdale St., Huntington Beach, CA 92647; 714/375-0591; fax: 714/375-0594.

• Paxton Automotive, 1300 Beacon Place, Oxnard, CA 93033; 888/972-9866; fax: 805/604-1337.

• Ptuning, Performance Tuning Inc., 8412 Kao Circle, Manassas, VA 20110; 703/257-1728; fax: 703/257-7619.

• Sportwing.com, 9155 Sweet Valley Drive, Valley View, OH 44125; 800/899-1516.

• Vortech Engineering, 1650 Pacific Ave., Channel Islands, CA 93033; 805/247-0226; fax: 805/247-0669.

Federal Agencies:

• Environmental Protection Agency (EPA), 1200 Pennsylvania Ave. N.W., Washington, D.C. 20460; 202/272-0167.

• Fueleconomy.gov, gas mileage ratings and information from the U.S. Department of Energy and EPA.

• National Highway Traffic Safety Administration (NHTSA), 400 Seventh St. S.W., Washington, D.C. 20590; 888/327-4236.

Insurance Industry Trade Groups:

• Highway Loss Data Institute (HLDI), 1005 N. Glebe Road, Suite 800, Arlington, VA 22201; 703/247-1600.

• Insurance Institute for Highway Safety (IIHS), 1005 N. Glebe Road, Suite 800, Arlington, VA 22201; 703/247-1500.

Publications and Consumer Information Services:

• Automotive Lease Guide (ALG), 115 S. La Cumbre Lane, Suite 100, Santa Barbara, CA 93105; 805/563-0777.

• Automotive News, 1155 Gratiot Ave., Detroit, MI 48207; 313/446-6000.