Quote:
Originally Posted by tyl604
The owner's manual for my Lexus says use premium gasoline. Then it says regular is OK but the gas mileage will suffer some. My reading of this is that the computer adjusts the engine to regular and therefore it is OK to run regular in it; perhaps extrapolate this concept to all other cars too.
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Don't extrapolate. Different manufacturers use different technology and computer programs. Some will advance the normal timing if high octance is used. Others will only retard if the octane is low, but can't give an increase for the hi-test.
Since your Lexus says you can use either, you should run a few tankfuls of hi-test, and then a few of regular, keeping careful records, and see which is more economical for your car and your driving. Improved gas mileage alone does not mean hi-test is cheaper--paying 3% more for hi-test only to get a 2% improvement would not make economic sense. However if paying 3% more gets a 5% inmprovement, then you are saving money by buying the better gas.
Also factor in how you drive--If your car accelearates faster on hi-test, and that is important to you, then the cost may not matter.
And remember, " Your mileage may vary".