This mornings trip to work
9 degrees outside temp, engine stone cold.
7 minutes 51 degrees 2 miles
10 minutes 60 degrees 2 miles
15 minutes 63 miles 3 miles
22 minutes 72 degrees 5 miles
average 14 mph 24.9 mpg
changing at 2500, no boosting, very light throttle
Standard apart from K n panel filter, broken air duct, pre-cat delete.
I hope this helps, but I still need to change my secondary thermostat, as i suspect it to be stuck at least half open.