[V8] Mileage/adaptive tranny?

[Michele_Deltergo at KeyBank.com]

I just got through a 600 miler +- and averaged 24.4 MPG one way and 22 MPG
the other!  It is relatively flat, same conditions/speed, cruise control
etc both ways, turn around was 1 hour after arrival.   Only real differnce
was source of gasoline, but same grade etc.  This type of variablity in
Mileage is driving me a bits nuts.  O2 is 3,000 miles old and car seems to
run fine if a bit rich any ideas?
Mike





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