2004 Toyota Rav4 2wd gas consumption question. (10 points see details please)?

Goku

New member
I currently drive a 2004 Toyota Rav4. It is a 2 wheel drive. I was wondering how much more gas it would take if I went 80 miles per hour on the highway vs 60 miles per hour. It runs around 2200 - 2300 rpg at 60. 2800 - 3000 at 80. Does this sound about right. Thanks for help in advance. Ill add additional details if necessary.
 
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