For ref I drive 110 miles a day. FSS lets me go the max of 16k miles generally. Has never let me go less than 12k.

Yours will differ (perhaps greately) if you only drive stop and go city miles and short trips only where the engine doesnt get fully warmed up each trip.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)