When I got my car it didn't have OD, and I would get around 14 mpg, I just got my tranny rebuilt and have OD, after the first time calculating mpg I am around 16 does this seem to be right, I was hoping for 18mpg.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
2:73 GEARS
Rebuilt 700R4, with manual valve body
coming soon B&M Quicksilver Ratchet Shifter

 

Sounds about right for overall driving. You should see the lion's share of an increase in HIGHWAY mileage...