Chris wrote:

If there is a head wind the difference is going be even greater.

A truly proficient pilot will plan fuel consumption based on forecasted
winds aloft for that day, any diversions needed, and then add 30
minutes (or whatever his/her personal minimums) for regulation
requirements.

A pilot who fuel plans with the assumption that the reserve will cover
winds aloft, unexpected vectoring, and diversions around weather is a
pilot who *will* experience a fuel emergency sometime during an
upcoming flight.

--
Peter