You realize that the original pipeline is still there? KXL was a shortcut that would save some money.
Also, the fuel processed from the pipeline is chiefly an export, so it wouldn't have affected prices in the USA.
Lastly, the XL pipeline was a huge risk to the American agriculture industry. There was opposition to it it on the right, particularly from ranchers in the region. Do you really think it's wise to put the beef and wheat industries in the north at risk just so refineries can sell oil overseas at a slightly lower cost?
Also, the fuel processed from the pipeline is chiefly an export, so it wouldn't have affected prices in the USA.
Lastly, the XL pipeline was a huge risk to the American agriculture industry. There was opposition to it it on the right, particularly from ranchers in the region. Do you really think it's wise to put the beef and wheat industries in the north at risk just so refineries can sell oil overseas at a slightly lower cost?