That article is a good primer but does not accurately describe the process in a modern car. Yes, the term heel-toe comes from the "old days" when the gas and brake pedal were so far apart that you had to turn your foot sideways to hit both at once. Most modern cars put the gas and brake much closer together. Most people can push the brake pedal with the ball of their right foot and the gas pedal with the right edge of the right foot. You will probably have to slide your foot to the right side of the brake pedal to leave enough of your foot hanging ocver the edge to reach the gas pedal. If you have small feet or drive a car with poor pedal position, feel free to rotate your foot as much as necessary tp reach both pedals.
If you plan on going to a driver school, practice and master your heel-toe technique BEFORE going to the track. The instructors will discuss heel-toe downshifting but will generally not teach it at the track because the consequences of bad heel-toe are too great (losing traction in back and spinning your car) too practice on track with other cars around. If you are not comfortable with heel-toe downshifting, tell your instructor so he can get you around the track with regular braking.
Hee-toeing may feel like you are giving yourself an open liver massage at first but with lots of practice, you will get the hang of it. I was eventually able to hee-toe in a buddy's 1989 Ford Bronco with a 4 speed. Ack!
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