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We have done a day trip of ~ 675+ miles from western NC to NJ, a couple three times per year, for the past decade. Our '01 E53 has a 5 spd manual, and thus our highway rpms are substantial, and detrimental to big mpg numbers...but, we often get high 22s and occasionally 23+ on those trips, based on arithmetic, not the mpg readout.
The difficulty in predicting 'expected' mpg is the potential stop and go traffic jams around DC or Balto, and any other unforeseen construction or accident slow downs along your route(s). Also 'load' plays a role, as does ambient temps and gusty winds, imo, from viewing the anecdotal 'results' over a decade worth of those trips.
Otoh, our '02 VetteVert has made that trip regularly too, and that sumbitch does 28-30+ mpg on every trip...fwiw.
GL, mD
PS: EZ Pass is your friend, in terms of rolling through the several tolls on I-95 vs stopping to get in line to pay.
Last edited by motordavid; 11-23-2011 at 01:49 PM.
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