1 gallon = 128 oz

1 gallon of Gas (grade 87) costs $3.10
1 cup of regular Dunkin Donut's 16oz cup coffee costs $1.60, $0.10 per ounce.
1 gallon of regular Dunkin Donut's coffee costs $12.80

1 gallon of Gas (grade 91) costs $3.35
1 cup of regular StarBuck's 16oz cup coffee costs $3.80, $0.2375 per ounce.
1 gallon of regular StarBuck's coffee costs $30.40

It is still cheaper to drink gas at the current rate, wondering why consumers complain?