Voltage gains vs weight = run time?

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Interesting.. Anyway my tekno v3 8ight buggy gets me 20minutes of HARD racing.. ~30minutes if I'm waiting for the nitro guys to refuel and cool down... this is w/ my medusa v2 60mm 2000kv and 4s 5000mah geared for 40mph. My 8ight-t I Just decided to run w/ my Neu 2.5d, so I plan on playing around for the rest of the year w/ a 4s config geared for about 38mph (17/48) and next year before the races start I will snag a pair of 5s 5k packs and regear to 15/48 for the race season.. that way I have fresher packs for the season. I'm hoping this combo will get me through a 30min a-main, time will tell.