Mark D,
funnily enough all my relatively modern 2 - stroke (2T) garden machinery (Stihl chainsaw/brush cutter/hedge cutter/leaf blower etc) runs fine on petrol rejected by the Mariner!
They do get slightly spoilt in that I only use Stihl synthetic 2T oil. but I've not resorted to Aspen in the Stihl machines yet.
Honda did do a range of 4T garden machines (not just mowers -they seem to have a good reputation?), but I've no idea if they were any good, or if they suffered from fuel issues. I do know that they were comparatively expensive, and heavy too.
The Honda "suitcase" generators are legendary! They seem to run OK on "ordinary fuel".