Quote:
Originally Posted by Ammunition
what are the effects of not putting premium in? I just picked up my car from the dealership after it was being serviced for a few days and it felt really heavy, or as if it was having a hard time accelerating etc. I don't know how other to describe it than "chugging".
I noticed that I had 3/4 a tank of gas when I picked it up, and I believe I dropped it off with 1/2 a tank, and the first thought that came to mind is that they must have not put premium in it.
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I could write forever about octane but basically the higher the octane the more resistance the fuel is to combustion. ie the higher the compression ratio of the engine the higher the the octane rating is needed to achieve consistent combustion at proper timing.
Lack of proper octane fuel in a high combustion engine (like our cars) creates "preignition" pinging, pinking, knocking, lack of acceleration are just a few symptoms.
If you had 1/2 a tank of 91 octane fuel 6.5 gal roughly and you add 3.25 gal of 87 octane fuel you would end up with basically 89.6 API octane rated fuel. The Manual for the fa20 engine recommends API 93 octane fuel. It also says "91 may be used with no detriment to engine durability or drivability." It then states that pinking(knocking) occurs with 91api. Which I find disturbing as we can't get 93 in Oregon.
In short running octane below 91api will cause knocking and could void your engine warranty.
That's about as basic as I can figure out how to put it. I hope this makes since to more than just myself.
RON-research octane number
API-American Petroleum Institute
Btw we have "fuel" now not "gas" but that's a totally different conversation.
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