In my '99 I notice an approximate 10% loss in mpg when burning B99.

Performance is pretty much the same but the turbo seems to be on earlier, and longer, which probably explains the mpg's suffering.

D2 = 31mpg
B99 = 27/28mpg

I go back and forth all the time.

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Terry Allison
N. Calif. & Boca Chica, Panama

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