With gas prices over $4 a gallon again today, according to the daily AAA survey, it's time to brush up on some tips for saving money at the pump.

Before you start driving:

• Watch Your Tire Air Pressure

Keeping the correct pressure in your tires is not only essential for safety, being smart with tire pressure, can also add up to 3 percent on to your MPG. Low tire pressure creates drag, which burns up more gas. Also periodic wheel alignments can bump your fuel economy up by 10 percent, says the U.S. EPA.

• Keep Your Car Serviced and Your Engine Tuned

Keeping your engine working at its optimum performance can help you improve your gas mileage. Make sure your car gets a regular service to keep it in good working order.

• Service Air Filters Regularly

Replacing a clogged up air filters can improve your MPG by as much as 10 percent, says fueleconomy.gov.

• Remove Excess Weight

Don't carry around excess weight; an extra 100 pounds could reduce your MPG by up to 2%. Drivers of small cars will gain the most from this tip. De-cluttering the car makes it lighter, and the lighter the car is the less gas it uses when accelerating.

• Remove the Roof-Rack

If not in use, remove the roof rack, it causes drag and eats up more gas.

• Don't Over Fill

Believe it or not, filling up adds more weight, so the less gas you have in the car the more efficient it is. However if you have to go out of your way to get the gas station, this is obviously not a good tip for you.

• Use the Recommended Oil

A modest improvement of 2 percent can be gained by just using the manufacturer's recommended grade of motor oil.

While driving:

• Be efficient with the Air Con

Use only as necessary and you will save big time!

• Close the Windows

Open windows, especially at higher speeds causes drag, which makes the car work harder and use up more fuel.

• In cold weather Remove Ice and Snow

The extra weight reduces your MPG

• Be Nice while Driving

Leave the aggressive driving for the video game, not only is it bad for your stress levels but aggressive driving costs you at the pump. Speeding, rapid acceleration, sharp breaking all lower your gas mileage.

• Slow Down, Watch Your Speed

Slow down, you might not get there faster, but you'll get there cheaper. Generally speaking, gas mileage decreases rapidly when you drive over 60 mph. keeping under 60 mph will help you raise your MPG considerably

• Cut down on excessive idling

Running the car, while stationary uses fuel.

• Don't over-rev

When accelerating try not to over-rev the engine. A controlled gradual acceleration uses less power

• Use Cruise Control:

If you have Cruise Control use it, maintaining a constant speed while driving on the highway will help improve your MPG. If you don't have cruise control try staying at a constant speed manually.

• Use Overdrive

Using overdrive correctly can help you increase your MPG, as well as helping reduce engine wear.

• Use the gears correctly

Driving in the appropriate gear for your speed will save you on fuel. Never over work the engine, make sure you are driving in the right gear. Driving in a gear too low for your speed will waste fuel.

• Give yourself time to brake and do so gradually

Sharp breaking uses more fuel than gradual breaking that uses the cars own momentum while slowing down.

And for a little urban myth:

• Fill up at night

And for the obvious:

• Buy a hybrid - being hybridcar.com we must include this.