Tire Pressure Fuel Economy

tire pressure
The manufacturer's recommended pressure for a tire, dependent on load, speed, etc., usually given in bar or pound-force per square inch (psi). (1.8 bar = 26 psi; 2 bar = 29 psi; 2.2 bar = 32 psi; 2.4 bar = 35 psi; 2.7 bar = 39 psi)
The measure of air pressure within a race tire.
Cold inflation pressure is the inflation pressure of tires before the car is driven and the tires warmed up. Recommended cold inflation pressure is displayed on the owner's manual and on the placard (or sticker) attached to the vehicle door edge, pillar, glovebox door or fuel filler flap.

fuel economy
Number that corresponds to the amount of miles that a vehicle can travel on a gallon of gasoline, referred to as miles per gallon (MPG). The higher the MPG of a vehicle, the more eco-friendly it is likely to become, and the less it is dependent on non-renewable resources.
A measure of the amount of fuel used by a vehicle over a certain distance, or the distance traveled per volume of fuel used.
How many miles a vehicle will travel for each litre of fuel used.