Wide-open windows, especially at highway speeds, increase aerodynamic drag and the result is up to a 10% decrease in fuel economy. The air conditioner puts extra load on the engine forcing more fuel to be used. Heavier vehicles use more fuel, so clean out unnecessary weight in the passenger compartment or trunk before you hit the road. Under-inflated tires make it harder for your car to move down the road, which means your engine uses more fuel to maintain speed. Keep your tires inflated to the proper levels.Check your owner's manual to find out what fuel octane rating your car's engine needs then buy it.Don't forget your spare and be sure your jack is in good condition. Check tire pressures once a month let the tires cool down first. Have your tires rotated about every 5,000 miles.Replace worn blades and get plenty of windshield washer solvent. A dirty windshield causes eye fatigue and can pose a safety hazard.Get engine drivability problems (hard stops, rough idling, stalling, diminished power, etc.) corrected at a good shop.
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