 I bought my Excursion in June and have 
put on 8200 miles since.  Most use is 
at 75 to 80 mph on highway trips 
without a trailer.  On those trips, I 
get over 20 mpg.  I have a 28' 
transporter which I use to haul ATV's 
and camp in.  With the loaded trailer 
behind it, the mpg drops down to 11.  I 
can pull the trailer both up and down 
hill as fast as I care to.