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03-23-2013, 10:55 AM
#41
Instructor
Food for thought:
It all depends on what elevation you're at (if you have a N/A engine). If you're at a higher elevation (I'm in Calgary, AB Canada), your high compression engine will perform better running 89 than 91... since the atmospheric pressure is lower, the engine will actually like a fuel that is slightly more prone to detonation.
A local guy here has done studies with a few naturally aspirated cars that he's bought brand new over the last few years, and every one of them runs better and produces more power on 89 when 91 is actually the recommended grade (he's dyno tested them for proof).
It all depends on what elevation you're at (if you have a N/A engine). If you're at a higher elevation (I'm in Calgary, AB Canada), your high compression engine will perform better running 89 than 91... since the atmospheric pressure is lower, the engine will actually like a fuel that is slightly more prone to detonation.
A local guy here has done studies with a few naturally aspirated cars that he's bought brand new over the last few years, and every one of them runs better and produces more power on 89 when 91 is actually the recommended grade (he's dyno tested them for proof).
Do you have a link to the actual report? I don't doubt his test results, but I'd like to see how/what variables he controlled along the way. Also (as Karanx7 said), ethanol content and other additives are a big factor in these types of experiments nowadays, even between grades from the same refiner.
Obviously not a shot at you personally, I have just seen way too many incomplete "studies" during my engineering days to know when all the factors are not being considered.
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