Gerry said it should be about $20. Well, in the USA when we've been they gauge it and you pay for what you use. Here in our hometown, your paying a set price, so you best be sure it's empty or near empty before you have it filled.
So we filled tank and guy says $27! I said "what"??
In the USA that same tank is $1.99 US/ $2.48 CDN a gallon
Here it's $5.74 CDN a gallon!
That same tank in the USA would have only costed us $11.67 CDN.
So in Canada more than double!