Whats better to trim fat?

Whats better to trim fat, if I would do say 2.5 miles at 5.5 mph on the treadmill or if I do 1.25 miles at 6 mph on the treadmill.

Basically what I'm asking is, is it better to JOG a long distance or RUN a shorter distance to burn fat.

I assume BOTH will get you into good cardio shape (lungs,endurance).

either try to jog and keep inside your target heart rate for 30-45 min or try
HIIT-http://www.musclemedia.com/training/hiit_table.asp
Find which works better for you and do a search on here for HIIT
For me cutting the fat works better by running keeping in my target heart rate for 30-45 min. but when i am tryin to avoid as much muscle loss as possible ill do the HIIT

i don't think just .5 mph is enough to affect the mileage by 1/2 as much...maybe if you were going 7.5 mph for 1 mile