I just started playing my level 52 mage again and have had a tough time get back into the swing of things. I play strictly solo PvE and was building a 10/51/0 spec. Even though I been doing quests in Searing Gorge - so the mobs are typically in the 47-49 range - I don't find that I'm mowing 'em down like I used to (or maybe my memory is just fault). I recently switched to 2/48/11 spec thinking that icy veins and imp frost nova would be helpful, but so far I think the build is worse for leveling (and others have indicated the same in another thread).
I can certainly kill one or two mobs at a time without a problem but I seem to be going thru mana like crazy. Two kills and a drink seems to be the norm. I'm not sure if the problem is my sequence of spells or my build, or both. My typical sequence is to open with pyro, followed by two frost bolts then frost nova. Then, depending on the mobs health, I either spam scorch or some more frost bolts. I will use frost blast to finish off a mob but it does seem to use a lot of mana so I tend to avoid it. If I'm fighting two mobs then I typically will sheep one so I can deal with them one at a time.
I'd appreciate any pointers on spell sequences, and even build suggestions. I'm even willing to switch to frost - I don't mind killing more slowly if I can be more efficient at it and be able to deal better with multiple mobs. I've been reading through the various forums and builds (e.g., at wowwiki) but haven't seen enlightening yet :) And, btw, I do have decent equipment, a combination of blues and greens with int, spi, sta and +dmg. Thanks.