Quote from DarthSidious:
Wondering why the discussion is so focused on stock pairs trading. I mostly trade futures outright, but a big chunk of my trading is spread between index futures pair. Like ES-ER2. Chart it and see. (Many other combinations possible + lot's of fun in fx pairs - but I haven't gone there yet)
All standard pair trading "wishdom" applies. However,
1) neither leg would get "taken over"
2) spread margins are downright sexy
3) No interest cost, ever
4) more intraday noise than you can handle
5) dream of leg-in / leg-out crowd
It's hard to get completely market neutral based on notional values of the contracts unless you are trading very big size, but I am willing to live with it. I personally don't see it as a problem actually