CR tested generators in Oct-2006. In order of rating within category below
In the small category (2800-3600W):
Honda model EU3000is claimed 2800W tested 3000W
Yamaha model EF3000iSE (EF3000iSEB) claimed 2800W tested 2800W
Craftsman 30250 claimed 3600 tested 2500
Troy-Bilt model 30248 claimed 3550 tested 2600W
Coleman model PM0523202.17 claimed 3000 tested 2500
In the midsize category (4500-6600W):
Briggs & Stratton claimed 6200 tested 4600
Northstar model 8000TFG claimed 6600 tested 5000
Troy-Bilt model 30245 claimed 5550 tested 3200
Craftsman model 30298 & 30521 claimed 5600 tested 3300
Coleman model PM0545005, PM0435000, PM0525302, PM0525302.18, PM0545003, PM0545004, PM0545006 claimed 5000 tested 3700
Honda model EG5000 claimed 4500 tested 4400