Anyone have some real GPS numbers for a 28 ZXO or 28 ZX with twin 260hp/ Bravo 1 or 300hp/Bravo 1? Thanks.

I've got a 28 ZXO with twin 260s and the best I've done is 71 mph GPS.

That number is very encouraging. I thought it would take the 320's to move it above 70. Thanks.

I did search the thread archives and came up with two threads that talked about speed that was helpful but some of those conversations talked about swapping props. I'd like to stick with what comes rigged out the factory door.

I have a 28 zxo with the 260 hp's and can only achieve 64 on GPS.

Here is the actual break down depending were you boat
In NJ area 28ZX or ZXO with twin 260s gps not speedo the speedo will read 70-71 mph GPS is 65MPH
28ZX or ZXO with 350 Mags 300 HP Speedo 72-74 GPS speed 68-71 depending on conditions
28ZX or ZXO with 6.2s 310 HP each Speedo 74-76 Mph GPS 70-72
28ZX or ZXO with Scorpions Speedo 82-84mph GPS 80 mph.
Hopefully this will help you