markatty Posted October 30, 2006 Share Posted October 30, 2006 I attended the Lexus reception in NJ and part of it included a presentation on maximizing gas mileage. Most of the stuff was fairly mundane stuff, but the woman did say that you can get 4 mpg more using premium gasoline. She said that the RX-400 has to get used to premium and it takes 3 tankfuls before the computer system takes advantage of the higher octane. So if regular costs $2.20 and you drive 12,000 miles per year, you need 461.5 gallons at 26 mpg for a total cost of $1,015. If Lexus is right and you get 4 mpg more then at $2.40/gal the cost would be $960 for a savings of $55/year. You should also get better acceleration. At $2.54 for premium the cost of gas would be the same. I tried premium and didn't notice any difference on one tank, other than slightly increased acceleration, so I've used regular. According to this USA Today article regular works just fine. Anyone actually see any noticable difference? Quote Link to comment Share on other sites More sharing options...
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