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This Note is concerned with the asymptotic behavior of the minimal KPP speedof propagation for reaction- advection-diffusion equations with a large driftMq (where q is the advection). We first give the limit of the speed asM\rightarrow+\infty in any space dimension N. Then, we give the necessary andsufficient condition that the advection field should satisfy so that the speedacts as O(M) as M \rightarrow+\infty.

Asymptotics of the KPP minimal speed within large drift