Yes, but not with a whole lot of miles on the truck yet. My city
mileage (lot of freeway driving) went from 15 mpg to 19 mpg. Highway went
from 17.5 to 24.5. No doubt I will have to adjust these figures somewhat
with more mileage.
I have a friend with a 1999 F-250 PSD with a performance chip and a K &
N filter. He is not towing, but he claims 18 mpg city and 24 highway.
-Tom mailto:tom@tompatterson.com
Website: http://www.tompatterson.com