Yes it is 50miles more per tank. i was the one who tuned his car. the ZZP pcm was running very rich on the low end and lean on the top. so i was able to dial that all back and the difference was amazing. just by being able to have the pcm tuned for your specific car will make a noticable diff.
_________________________
96 Z34 (3.4L DOHC RIP PB 14.81@92.2):
www.cardomain.com/id/z34phoenixL36 swap SD header, 2.5" exhaust, HV3, PowrTuner, Wideband, topswap w/ ported heads to be installed