JA Waiver Real Impact

From another thread:

Sarcasm I presume?
Questions:

  • How would California, Oregon and Washington State get sufficient supplies of petroleum products, if not for the extra capacity offered by using foreign flag tankers under the waiver?
  • Where would the extra tonnage come from, if not for the waiver?
  • What would the price of petrol be on the East and West Coasts have been, if there were no extra shipping capacity when ME crude supplies dried up?
  • How many JA trade ships and ATBs are idle, laid up or scraped because of the present waiver?

PS: Refineries can NOT change from Heavy Crude Oil to WTI overnight.