First a little background. I'm a type 2 diabetic currently controlling my blood sugar with diet and exercise. I have found great success with a ketogenic diet and my body is currently doing very well fueling with fat.
Now for my issue. As my body fat has dropped (last measurement was less than 8%) and my time on the bike increased, I am finding myself pushing past the point where I need to refuel during a ride. My ability to sustain my effort drops significantly around the point where I have used up the calories I've eaten in my recent meals. While I do slow down, I appear to be a long way from bonking as I still do well on climbs and seem to be able to sustain the lower effort for quite some time. Everything I'm reading is pushing the need for carbs. While the best information does say to avoid the simple carbs, they are still pushing more carbs than I am willing to eat. Since I'm also reading that you need to get better at burning fat and that you can fuel long rides with fat, I'm trying to figure out the best way to take on more fuel during a ride using fat.
One thing I've considered is taking some oil with me and drinking 1-4 oz (250-1000 calories) at some point during the ride before I hit that wall. Before I try that, I thought I'd see if anyone else is doing that and if there is anything reason not to try that. Is there a better fat fuel source? Any idea on how long it will take to make that energy available? Any suggestions on timing when to eat it?