My two penneth worth.......
There are plenty of type-specific techniques that have been helpfully posted, but I'm not sure that's the point of this thread.
In my opinion, the wind is by far the greatest performance variable when discussing max range. We all know wind generally is stronger at height and veers slightly (in the N hemisphere). Therefore, with more than about 10kts of surface wind, you always fly high with a tailwind component and low with a headwind component.
As for best-range cruise speed (best specific fuel consumption), I don't fly anything with a fuel flow gauge, so would dearly like someone to post a rule of thumb that works for modifying the AFM best range speed for wind effects.
J