IRVINE, Calif. — Gasoline prices are a major expense for any limousine operator. But there are some ways to cut costs. Kelley Blue Book, Enjoythedrive.com and Response Insurance offer these money-saving tips:

• Gasoline is densest when it is cold and drivers are charged based on volume. Buying gas during the coolest time of day, usually first thing in the morning, yields more gas per gallon, thus leaving you with more gas for your money.

• New spark plugs and wires can make a difference in gasoline mileage. An upgrade to high-performance spark plugs and low-resistance plug wires can improve fuel economy and performance, as well as reduce emissions.

• Four tanks of gasoline with "Techron" can clean your fuel injectors as well as most professional-grade cleaners. Clean injectors will help your vehicle get up to 5% better gas mileage.

• Check the air filter and tire pressure. A clogged or dirty air filter can slow down the car and use more gasoline. A clean filter will promote less gas waste. Under- inflated tires could also cause excessive drag, slowing down the car and using more gas.

• Accelerate normally from a fully-stopped position. Avoid flooring or stabbing the gas pedal since that action pushes more fuel to the engine than is needed to move forward and wastes gas.

• Don’t idle for more than two minutes. When the car isn’t moving and the engine’s running, you’re getting 0 mpg.

• Lighten the car’s load by taking unnecessary items from the trunk. Every 200 pounds of weight reduces gas efficiency by one mile per gallon. Check out our Fuel Management Calculator:
Fuel Management