Did you know that wrongly inflated tyres can severely reduce your fuel economy? Seeing as fuel is hard to come by in Nigeria at the moment, now's a good time to check your tyre pressure.
The softer your tyres are, the greater the friction between the road and the rubber, and the harder your engine will have to work to move the car. On the other hand too much air in your tyres can seriously jeopardize your car's handling. That why it's very important that you keep your tyres at the recommended pressure, which represents a good balance between ride, handling and fuel efficiency.
If you're not sure what the correct tyre pressure is for your vehicle, you can find it on the door to the glove compartment or on the driver's-side door pillar.

I thought the reverse was the case, cos when the tyre pressure is low the engine tends to do alot of work... I always over gauge my tyres by +5psi...

shaddi:
I thought the reverse was the case, cos when the tyre pressure is low the engine tends to do alot of work... I always over gauge my tyres by +5psi...

City driving may require appropriate psi, for example
tyre with 51psi, may be inflated to 48psi
But when you need to hit the road across cities, deflated it to 40psi.
This will effect a better tyre grip on the high way, that has been standard in continental USA and Mexico
Please psi stated for example purposes