Quote:
Originally Posted by thingstodo
My wife discovered that Costco's premium fuel is about 15 cents per liter (55 cents per US gallon) lower than the competition. So I'm going to try a few tanks of premium. If the gas costs 10% more and I get >10% better fuel economy ... the numbers work!
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It won't get 10% better fuel economy. Maybe closer to 1% or less.
That said, experiment away.
I'll be alternating premium and regular (since it's cheaper than mid-grade, which is a 60% regular, 40% premium mixture) in my TSX simply because I can tell the difference in driving performance. I'll fill partial tanks so that the fuel stays around mid-grade octane.