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kidboy
@Greenbank
Weight has a huge impact. I watched my 5k times go down by over 5 minutes (so more than 1min/km) as my weight fell (88kg to 83kg).
It also feels much nicer not to be lugging that extra weight around too, running (and cycling) just feels easier.
If you put your distance, time and weight in here: http://fellrnr.com/wiki/Running_Calculator you can get predictions on how losing weight would affect you (based on VDOT/VO2max). Look for the "6.2 Weight Adjusted Race Times" section.