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Just wanted to note.. temp differences are not that great on a truggy setup correctly going from 4s to 6s. If you have a weak ESC running higher voltage will keep the avg amp draw down but not peaks... so in a word if you run a motor matched for your ESC and vehicle size you won't see any heat issues or any extra run time with such a little voltage change. Also assuming race setups of equal speeds around 40mph or just under. Now with that said you have to realize the differences in lipo's for mah and physical size, you have to reduce your mah when raising voltage to keep the same reasonable pack weight but with the higher voltage you see more run time on the reduced mah, so you typically wash in almost all cases unless you were comparing a super small and light weight 4s 5k battery and going up to a much larger 6s 4k or larger pack. I have run 6s 5s and 4s configs in my truggy and to be honest the setup that has been most reliable and that I win the most races with is a MMM 1y combo in my 8ight-t tekno conversion. I run 4s 35c 6500mAH hyperion lipo's and get 17+ minutes at full speed on my track (race conditions and 3 of 5 have been 1st place finishes)

14.8 x 6500mah = 96200 (best pack size/run time)
18.5 x 5000mah (typical 5s pack) = 92500 (same weight as the 4s 6500 and a touch less run time)
22.2 x 4300mah = 95460 (weighs a touch more than the 4s 6500 (for HQ packs anyway) and has a touch less run time, even more if you are only at 4000mah or less)

Obviously you can't compare mine to someone elses directly as truck weight, drivng style and track all play huge roles in the mah/per minute.. but in the same truck I get the best run times and feel w/ the mmm 1y 4s combo. The other two setups I ran were with a neu 2.5d finned @5s 5k (ran for most of a season last year), and I tried out a medusa 1300kv on 6s for a few days to compare as well.