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[fu_im_from_texas]

Originally Posted by hystria

PROBABLY higher octane/RON will provide better fuel economy with this car... but the difference will be too minimal to be easily measured by just checking a mileage variation. YES, Toyota recommends using higher octane/RON for this engine in order to obtain better mixture burning, resulting in less polluting emanations. Buying 10-15% more expensive 89/91/94 gasoline won't result in 10-15% mileage increasing. Check out the black smut (?) on the exhaust when running on 87 octane, then whip it off and switch to 91 and check again.

"....using a higher octane gasoline than your owner's manual recommends offers absolutely no benefit. It won't make your car perform better, go faster, get better mileage or run cleaner. Your best bet: listen to your owner's manual."
http://www.ftc.gov/bcp/conline/pubs/autos/octane.shtm

why do people insist on ignoring empirical and statistical data?