Because fuel consumption is affected by tire condition (pressure, flat tire etc...), All tire pressures always should be checked.
Be sure the vehicle is on level ground.
Turn the engine off.
Check the parking brake and shift lever "P" position for safety.
Check the tire pressure with tire pressure gauge.
Specification: 30±0.1 psi
Is the tire pressure within specification?
YES
Tire is OK
NO
Inflate the tire and check tire condition (tread wear, flat tire etc...)