Most excellent thread resurrection
Quote:
Originally Posted by Troy Sr
...There's more latent energy in the lower octane fuel than the higher octane fuel...
...if you have higher compression in your engine, then you will make more power.
You should run the lowest octane fuel that you can without having detonation in your engine. ....
|
Basically true. However, modern vehicles use multiple sensors (ie. knock sensor) to monitor engine performance.
For instance, a modern vehicle will compensate for cheap fuel on a hot day at high altitude. The vehicle will not ping, it will basically "detune its self". That vehicle might gain performance with a higher octane fuel.
Generally one may not notice this, as most of todays rigs have hp/tq to spare. If you're driving something that is woefully underpowered, this can become apparent very quickly.
Source:
I drive a 4 banger Jeep on mud tires over a mountain pass regularly.