I have this post on my build thread but I think it kinda got buried and I'm actually pretty curious about this, so I wanted to post it here and see what people have been coming up with on their setups.....
I know that there's not going to be any "apples-to apples" comparison on this but say, a Flying Saucer or Zip with a Mark 55 (or a newer 4-stroke), or a Mighty Mite with a 4-cylinder inboard? Just very curious I guess.....

"OK, I've gone off on a tangent and I have a question.
One of the reasons I chose a Honda R12X for powering the TNT is that it is one of the more fuel-efficient skis built, despite having a not so efficient hull design. According to my research, this 842 lb ski with lots of deadrise will burn approximately 3.1 gals/hr at a 35-40 mph cruise. With the TNT being both lighter and a more efficient hull, and using a slightly more aggressive impeller to take advantage of that, I'd guesstimate <3 gal/hr at a similar speed. With jet drives having a reputation as gas-guzzlers that doesn't sound horrible to me, but all my previous experience is with full-size 18-20' boats with big-blocks of anywhere from 500-1000 hp so economy was, let's just say, never a priority.....
I guess my question is how does that compare to other outboards and inboards here on the forum?
I like the idea that with the two 5 gal side tanks I have slated for the build that cruise range would theoretically be in the neighborhood of 125+ miles (as long as I can keep my foot out of it....

Thanks everyone!
Dave