About tire pressure)) - Toyota Carina ED, 1.8 L, 1997

I’m driving and I think that my fuel consumption has increased greatly, I have already begun to get upset. And then yesterday I decided to check the pressure in the wheels)))
3 wheels for 1.5 points. and the front right 2.25 points (someone podkochen at night, so that I could increase the flow? O_o)
Did everything as expected - 2 points for each wheel)))
And surprisingly - the consumption fell)))