Research for situation 1 doesn't always directly apply to situation 2 if you want honest results for the zombie situation start with the lowest grade fuel that is common in your area, and then add a few tablespoons of water.
I gave a good chuckle when I read about adding water. You're right. The problem is, I'm not likely to make this in any event. So, "cheating" with high quality (meaning no water hopefully) E0 fuel is going to be required … and even then probably going to get eaten by zombies.
Yeah, I would think this sort of speed range would yield much better mpg than 45-55. I think I’d be targeting around 40 mph in 5th gear if I wanted to maximize fuel economy to outrun zombies.
I'm not going to argue that anyone is wrong here. Fact is, I don't know. But I do know where this sucker is lean, because my AFR gauge makes it clear. From 45 to 50 mph, it too lean. So much so that at times it feels like it is running out of gas. I glance at my AFR gauge and it will be at 20+ AFR. Like pulling the most gentle slopes (up). A tiny twist of the throttle, opens the slide (more air), but the main jet is not spilling gas just yet, so it is very lean.
Anywho, this is kind of my thinking. Maybe 40 mph might be better. Or 35 mph. But this is going to take a long time and a large bladder as it is. So I don't want to go slower than 45 - 50 mph. An argument in my own mind is this: At 45 mph (level ground in 5th), I may be running 18.5 AFR. Same conditions at 50 mph I may be running 20.0 AFR. It's leaner at 50 mph, and covering ground more rapidly. So in theory it may be achieving higher mpg at 50 mph vs 45 mph. But things are complex. So the answer is not that obvious. So, I'm going to try to hold the throttle steady in that speed zone and just let the slope dictate the speed.
In zombie apocalypse mode don't leave home base without enough supplies to return!!!
As far as most fuel efficient operation. Speed isn't the biggest factor. The manifold pressure and mixture is. Higher vacuum the more fuel will be pulled from the carburetor. The least amount of differential pressure in relation to slide position is what you seek. Combine that with a slightly lean mixture and you're all set.
Hyper-miler 101. Reduce throttle going up hills, speed up going down them. Keep a constant speed as best you can. Don't stop if you don't have to. Minimize accelerating rapidly. If you have to use your brakes you used too much fuel.
In a zombie apocalypse used oil containers make great gas cans. Carrying an extra half quart of fuel might be all you need to make it back to safety.
Whatever you do don't run out of fuel while on the go. You're then a sitting duck.
Yeah yeah, all that stuff. But I ride sort of like I'm roadracing. Cause I done done that. I sort of sport around on The Piglet and blip the throttle down shifting, and it's all very smooth and stuff. But on the zombie ride, I have to remember … no blipping. I'm very good slowing down early and letting the engine brake. No problem there. However, drivers behind me have no patience for that, they are in a big hurry to accelerate to the red light that is obviously just ahead. But to heck with them on this trip. They're not trying to avoid zombies. I just have to fight to remember not to rev match when shifting down. I do it all the time.
I've been doing the math. In order to make it, I will have to achieve in the neighborhood of 105 mpg. Is it feasible? Yes. Is it likely … meh, no. So I will have a small Gatorade bottle (big necked for no mess fill up) in a backpack. Once I go to reserve, I'll know if I'm going to be able to make it.
Get this, I have to make it 200 miles on 'ON' (before switching to reserve) in order to make it. We have a 2.6 gallon tank. Minus 0.69 gallon reserve. 2.6 - 0.69 = 1.91 gallons. 1.91 gallons x 105 mpg = 200.55 miles.
So if I run out of gas on 'ON' prior to 200 miles, I'll know there's no chance to make it. If I do make it to the 200 mile mark, then 105 mpg x the remaining reserve of 0.69 gallons = 72.45 miles.
The total trip is ~ 270 miles. ON = 200 miles; RES = 72.45 miles. So that's the key. 200 miles on 'ON.'
Before I leave on this trip, while in my garage, I'm going to add so much fuel, pushing the cap closed may spill gas out. It's going to be PUKING FULL. Just like anyone would do when their life is on the line!