I don't draft very much but I do find it handy for extending an Interstate coast to a off-ramp. Rather than counting stripes (they vary) I try to set up the "Sight picture" Wayne Gerdes posted on his site.
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2000 Ford F-350 Super Cab Pickup
4x2, 6 speed manual
Regeared to 3.08:1
4 inch suspension slam
Aero mods: "Fastback" fairing and rugged air dam and side skirts
Stock MPG: 19
Summer MPG: 27.0
Winter MPG: 24
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