I'm 6'4 - 150 pounds when "race" fit (5k/10k/marathon), currently i'm around 157 (just now picking up mileage again).
Last year before I trained for Boston I was around 160ish with 15 weeks to go. I basically lost about a pound a week until I was around 148ish by pre-race day. This is how I accomplished this:
(mileage-wise) - I averaged about 115 miles a week (it flucuated from 100-130). Two workouts a week and one long a$$ long run (best way to burn calories - LONG RUNS).
(nurtition-wise) - I was running twice a day most days, so this limited was my stomach could handle for the second run (a plus), I survived off rice, bread, big green salads or peanut butter and jelly sandwhiches, (for lunch meals). For dinner it varied. That was my one time of the day to REALLY eat what I wanted (since I wouldn't be running again for another 12+ hours.) I'd drink beer several times week - but in moderation. When you're running 15-18 miles a day, it's hard to even level-off your calories burned/calories consumed ratio.
(lifting-wise) - I didn't lift. BUT, I would do core work (abs etc) six days a week, and three of those days I'd work my arms with a 9lb medicine ball. so there wasn't any real "lifting" going on, just light (weight) and lots of reps.
I know not everyone can (or wants to) run over 100mile weeks, but if you're around 80-90 range you can still pull off some serious weight-lose by eating good carbs (rice, salads etc) and you'd be surprised how filling they could be.) Pretty much like what's already been said: don't eat bad foods (fast foods, greasy foods etc etc). Stick to good carbs that you're body will use efficiently. Maybe start the day with a coffee and a peanut-butter sandwhich (to jump-start your matabolism = good thing)