Quote:
Originally Posted by Xan
Kannibul basically has everything covered.
The only things I can add is, on top of fuel not always being exactly as posted, hot outside temperatures could also induce knock and have your ecu retard timing.
Although the inlet air temp map will most likely be retarding the timing to prevent this, higher octane fuel could help here to reduce that effect.
Also certain types of molecules that mid and regular fuels contain do not exist in premium fuel, therefore premium fuels leave less deposits.
Finally as all major companies have their own additives to prevent build up, but in their process build up themselves, it can't hurt to switch brands every 3000 miles or so.
(although some companies buy their additives from others, so it won't work then)
The principle behind this is that one brands additive will remove the other and switching prevents maximum build up.
(I don't have any prove of this, maybe someone else has seen research on this? But it makes sense to my and it can't hurt)
|
Right, I wasn't accounting for air temperatures and effects of cold air intakes and so on.
The part on less fuel deposits with premium fuels (in general), I don't believe that is true. I do know that different companies put in different additives, however those additives are done at the distribution station...the company requesting the fuel can request their "special recipe" and it gets mixed as the truck is getting filled up. That being said, it's about the same (generalization!) as putting in BRAND X fuel injector cleaner with a tank full of gas, vs a can of BRAND Y fuel injector cleaner. The levels of additives are in the extreme less than 0.01%. Not like with engine oil....
Also, if anything you'll end up with more carbon deposits if you use premium fuel in a non-premium-required-vehicle.