Nice video!
Hows fuel economy?
Also would be interesting to know whether it gained any torque/power.
Probably no measurable change in either fuel economy or horsepower/torque (speaking in "absolute" terms, i.e. manufacturer claimed max hp, max torque).
I'm fueling the bike at about the same Air/Fuel ratios that a GSF400 with a set of very fresh, very clean and very well tuned Mikunis would get (carbs with no worn brass or questionable o-rings or air leaks, perfectly synched, etc., etc.).
I haven't changed the engine's displacement (no larger pistons), nor have I added any sort of forced induction (no turbocharger, no supercharger) and I haven't added nitrous oxide injection.
This means my fuel injected GSF400 engine has
exactly the same volumetric specifications as a carbureted GSF400 engine.
So the "absolute" numbers that people love to quote are almost certainly unchanged (the quoted numbers are, of course, the "peak" horsepower and torque taken from the manufacturer's literature which are produced on a dynamometer with the bike in perfect mechanical condition, running perfect Air/Fuel ratios in optimal environmental conditions such as sea-level pressure on a 60 degree F day).
The benefits of fuel injection occur "in the margins" of the engine's operating envelope. With the added benefit of long term reliability and easy tuning.