They're up, they're up and they're getting higher. Gas prices got you down? If telecommuting and public transportation are not viable options for you, here's some down-to-earth advice from the pros at the non-profit National Insitute for Automotive Service Excellence (ASE).

It is important to keep your vehicle properly maintained and change your driving habits so as to maximize your milage.

Monitor your tires. Undeer-inflated tires or poorly aligned wheels waste fuel by forcing the engine to work harder. Let the tires cool down before checking the air pressure. Out-of-line wheels, as evidence by uneven tread wear, should be aligned by a professional.

Consolidate your daily trips and errands. Some trips may be unnecessary. Also, try to travel when traffic is light so you can avoid stop-and-go conditions.

Avoid excessive engine idling. Shut off your vehicle while waiting on friends and family.

Use windows and air conditining wisely. Your mileage should improve if you keep the windows closed at high speeds, since air drag is reduced. This is true even with the air conditioning on -- assuming that the system is in good working order. If possible, try to avoid using your air conditioner in heavy, stop-and-go traffic jams or holiday weekend back-ups.

Keep your engine operating at its "peal effeciency." A well-maintained engine will help you maximize the gas milage for your specific make and model. A misfiring spark plug can reduce gas mileage. Follow the service schedules listed in your owne's manual. Replace filters and fluids as recommended, have engine performance problems (rough idling, poor acceleration, etc.) corrected at a repair facility.

These conservation tips will not only save gasoline, they'll help extend the life of your vehicle and help you conserve precious natural resources.