I like the pimp my ride approach.
Drive down the road and have your friend yell out the window when he gets to 35 , 55, 75. Get a 3x5 card and write down the differences.
Example: 75 real life ='s 72.
You have to see the correct pimp my ride episode to get it but really I think if you just multiply by 5% you should be very close.
So 75 mph would be real life almost 79.
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