The MD80 that I fly used about 78 pounds of fuel for each 1000 pounds tankered on a typical trip from Seattle to Oakland. So about 7.8% was used up.The fuel price in Seattle was better than in Oakland. On a trip from Seattle to Anchorage the burn was about 125 pounds or 12.5% used up.
The price of jet is so bad now that my last trip to San Jose the entire return fuel was tankered! I left Seattle with 32000 pounds of fuel!