i have a 2220 pro with a 300 v-max hpdi - 10" jackplate - no trim tabs - semi loaded it will run 64 on gps although the analog speedometer says 74. i have never heard of any blazer around here doing much over 66-67. i hear tell of a guy running a 2420 w/ 250 hpdi hitting 69mph. i went to accu prop to get my prop tuned and they had to had to pitch it down from a 25 to a 24 to get it true. i am still turning 5400rpm but lost 3mph. oh well, it is just to uncomfortable @ 60mph.
2220 professional 300 hpdi