Tires were tremendously short. Rubber had not been stocked in preparation for the War as had manganese, chromium, tungsten, and other items. The powers that be, Roosevelt cronies, said all along that we will just recycle the old rubber when we need new. Turned out it could not be done. Obvious you cannot de-vulcanise. Bunch of Doofusses.
Pretty much tires were strictly black market, criminal activity, I recall being told. Always has been no shortage of crooks. They seem to vote Democrat, naturally!
Gasoline was available, farmers had excess, and others. Not criminal but tertiary vendors, as it were.
Food rations look adequate to me. No problems except for butter that I can see. Non hydrogenated lard is a good substitute. You can live on 90% spaghetti, vegetables, and Spam and be totally comfortable. Bored, sure.
In reality not all foods were actually available, not for sale in your area. Actually the ration is generous and could have been cut in half or quarter without causing suffering if you could get the unrationed foodstuffs. That would have caused a lot of complaining, though!
The ration after the war in Germany during the occupation, American Zone, was 800 calories per day for working adults. Much worse than that in Japan. These are real hunger levels.