Prices are without the 10% bonus exp. Iron i = 1.6M and 32.5h Iron ii = 7.2M and 17.3h Iron iii = 8.1M and 15.3h Steel i = 5.7M and 26.0h Steel ii = 10.6M and 14.4h Steel iii = 18.1M and 10.4h Looking at it, i think iron III is the best, what about you? Well, going from 85-87 last week I did iron i until I realised that iron iii was decently cheap so I swtiched over. But I also got 75-85 smithing superheating bars for profit because I didn't want to lose Gp even though at the time I had like 100M. So I'm probably a bad person to ask because I do both the cheap/slow and the fast/expensive methods of training depending on the day. You need to ask yourself. Is an extra 6.5M worth the 17.2H saved? And for iron Ingot III, i actually got 6,851,988 gp instead of 8.1m, so only a difference of 5.2M [spoiler=Calculations]4719(Ingots needed) * 12(amount of iron needed in an ingot) * 121 (iron ore price)