So if the mix is below 50/50, ethanol to water content:
- Is it less flammable, in the event of a crash
- Is the mixture still worth it, from a performance standpoint
No. It's just complex to answer quickly.
Under 50 50 is much less flammable. Remember that washer fluid is already methanol and water. So you are are already part way to danger town with your stock car. Low temp winter blends of washer fluid can be just over 30% meth.
Is 50/50 worth it? Is injection worth it at all? It depends. On a stock car, less so. Depends on how hard you run and how hot it is.
With a tuned car it also depends. User, "Breaking Badly " saw a big temp drop but his ecu cut boost way down, so he saw no gain. Do all tunes do that? I don't know. Why did his do that? I don't know.
If you have a Jb4 setup, stacking or just JB4 you can see big gains. Because you can up the boost to take advantage of the lower intake air temp and higher ignition advance.
Or with APR for example, you could run a 100 octane file on 93. I'm sure they don't officially advocate for this, but it can be done.
My gut feeling is that everyone will benefit from a small nozzle 50/50 spray. Just like everyone will benefit from a better intercooler or good gas or a nice cool day.
Some people have shared successive logs with stage 1 or 2 cars. You can see that sometimes overall timing is down or an individual cylinder has it's timing pulled. No big deal. This is normal. But with a properly setup system, maybe you will have full timing all the time with no pull? Plus, cooler intake air. Full power all the time regardless of how many pulls or what the temp is outside.
With injection you get cooler charge temp, cooler combustion chamber temp and that ads up to a more dense charge with less tendency do detonate. Whether you can make more power or not lies in the details.