[V8] Causes of Bad MPG?

[Jason Wilkerson]

Ok, Wow - thanks for all the fast replies.  Lets see if I can address them
all.

   Few notes:
     - #2 seems to run the same as #1 - great.
     - gutted cats - same as #1
     - different wheels and tires on #2 but same OD as #1
     - Plugs seem new, slightly brown and dizzys are clean - no misses
     - Put FPR from #1's engine on #2 because I had it when I parted the
car - was only about 10k old.
     - No fuel smell
     - Calculated actual milage on #2 at about 14MPG (showing 15.5 on
readout - normal for a v8q)  If I remeber correctly #2 had about 18.5MPG
calculated under the same driving conditions.  
     - I don't have a check engine light on (I don't have one but I have
an LED attached at the floor - can't get the check engine light to work
even with installing it in the dash - but that I think is un-related -
even tried a new ECU), but I did check the codes when I first bought the
car and returned nothing - the MPG has not changed since I bought the car
- about 750 miles ago.  
     - The car did sit for about a year before I bought it - any Ideas
what could happen over time to cause this.
     - Oil and Coolant seem to be at a normal level - the Coolant seems to
run a little hotter than on #1 and #2 has a new radiator and pump? it runs
around 80c and #1 ran at 50c if I remember.

                Thanks,
                      Jason 


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