Quote:
Originally Posted by Sandys Toy
How about high octane?
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My wife has just over 67k miles on her '07 Tundra (5.7) and found that she gains almost 2MPG when she uses 91 octane (mid-grade) versus 89 octane (regular). Going to 93 octane (premium) showed no benefits over mid-grade in her truck. I've only filled my '08 Tundra once since I bought it a couple of months ago, so I don't have any comparison data for my truck yet.
Of course, this could vary widely from region to region depending on the fuel formula in your area.