Squealing could be caused by a number of things.
1) Dust in the drums. As the shoes wear down, the dust produced builds up in the drums. This could cause squealing when braking.
2) Cheap linings. Low-cost linings do not withstand the heat build up well after repeated stops, especially in city driving. When the linings get hot they are known to squeal. This is also accompanied by reduced braking and increased braking effort on the driver”s part. That is, you need more distance to come to a stop and the brake pedal Read the rest of this entry »

You can improve your gas mileage by up to 3.3 percent by keeping your tires inflated to the proper pressure. Under-inflated tires can lower gas mileage by 0.3 percent for every 1 psi drop in pressure of all four tires. Properly inflated tires are safer and last longer.
The proper tire pressure for your vehicle is usually found on a sticker in the driver””s side door jamb or the glove box and in your owner””s manual. Do not use the maximum pressure printed on the tire””s sidewall.