That's OK. Gas is still 3.35 (and 9/10ths):stupid:The metric system is much simpler to use (of course) and there are relationships between volume and weight that we don't have in our system.
For example, a liter of water weighs one kilogram and a cubic meter of water weighs one metric ton.
How much does a quart of water weigh?
How much does a cubic yard of water weigh?
How do you put one foot 5 inches into a computer?
I could go on and on but I'll stop.