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I have experimented with regular 87 and mid-grade 89. They say the best economical speed is around 88 km/h. I assume that is with regular. I have this theory that higher octane raises your best economical speed since it provides more horse power. The reason I say this is because I noticed that going at 100 km/h on mid-grade 89, the rate of liters of fuel burned was the same as going 88 km/h on regular. Liter for liter, I covered more distance on 89 octane. I assume that for those who did not see much gains is because they travelled the same speed for both 87 and 89. My next experiment, I will be using 91 octane, and I will again increase my speed to see if this trend of increasing the best economical speed continues.
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