Often not the case for best range Dave. LRC is invariably the IAS for max range, plus a bit, ie slightly quicker than max range speed with a slightly higher fuel burn. Therefore you get a slightly quicker transit for a small additional fuel burn.
It then gets more complex when you factor the wind. With a head-wind you will get a better range by flying slightly faster than the still-air max range speed, with a tail-wind you go a tad slower. Use the FMS Perf pages to find the altitude/IAS for best SAR (Specific Air Range).