I know this is a tough question because the 302 had TRS or KAAMAS whereas the 311 had bravo's or TRS and the 292 only had Bravos for a 454 mag . NADA says the weight of the 292 is 7000, 302 is 6950, and 311 is 7400 . I guess the silent thunder box makes the 292 weigh as much as the 302

But if all the models had bravo drives would there be a huge difference in speed? What honest speed would be expected?

From what I heard, the 292 was not a good a design as the 311. Basically same top speed with less rough water handling than a 311, and cost close to a 311. That's why it had a short life.

The old pre '86 302/272 hulls were a little lighter (as you already posted) than the later models, so you might get an extra couple mph, but that's about it. The 311 was known to be one of their best handling hulls though. I can attest to that

Agreed. Very solid and PREDICTABLE ride. THe 382 will walk through stuff that the 311 would get loose in, but with 5 ft longer running surface and #3000 heavier, I would expect that.

My 311 with 454 Mags ran 67-68 all day every day, heavy or light on fuel.

I have an 89' 311 and when I bought it, it had Mirage 23 inch props on it, with 454 mags. The boat ran 64/65 on gps.

Since I have: swapped to Hydromotive Quad IV props, swapped the exhaust to an Eddie Marine Thunder aluminum manifolds/risers, yanked off the silent thunder box and installed Stainless Marine thru hulls with the superflapper. I lost 84 lbs. PER engine with the exhaust swapover and probably 250 maybe 300 lbs on losing the box, for close to 500 lbs or so of dead weight right over the props. When the boat is docked, the stern sits about 2, maybe close to 3 inches higher out of the water. Less drag. Have two 250 lb guys stand on the swim platform and notice how the stern will lower in the water. You'll see what I mean. Plus the Hydromotives are stern lifting props, and our boats are real azz heavy, so they helped with the drag as well.

I'm now, depending on conditions, seeing anywhere from 71 to 73 gps and hit 74 once.

Figure I got a solid 8/9 mph increase with what I did. Cruising speed is what really improved. 7 mph difference from "old to new". I rarely run my boat faster than 55 or so. Can't afford to fix it if I break it. I just like a comfortable cruise speed.

Hard to find a boat better in rough water for it's size than the 311 SR1.