calculations

1 gallon (liquid) = 3.758 liters
1 pound = 454 grams
1 US dollar = 118 Japanese yen

Therefore, in Japan
one gallon of gas (current price regular unleaded, 124yen/liter) is $3.94.
one gallon of milk (168yen/liter) is $5.35.
one gallon of kerosene for my heater (59yen/liter) is $1.88.
one gallon of dish soap (154yen/250ml) is $19.62.
one pound of tofu (medium quality, 99yen/330g) is $1.15.
one pound of boneless chicken breast (on sale, 62yen/100g) is $2.39.