Sidewinder Off-Road 30% nitro, purchased from my local hobby shop (4 minutes from my house, where my local track is) has been my cheapest option ever since Bones Brew's fuel division went tits up about 3 years ago. And I only tried out and switched to Bones back in like 2020 because Byron's vanished.

I was somewhat worried about Sidewinder because I didn't get the impression that it was "serious" enough, simply because I never saw sponsored race guys running it, but I'm now 3 years into running Sidewinder and can confidently say that it's been great. 10/10, zero complaints.

To be honest, as far as engine behavior / tune / idling / power / etc., I've never been able to perceive any difference in the different fuel brands I've run, and that includes buying a gallon of VP Lutz Blend like a year ago when I was at an out-of-town track, and a gallon of the old Losi Nitrotane (20%, the only non-30% I've bought) back when I picked up a pullstart RTR Losi to get back into the hobby.