On my X5 once I experience knocking with using regular too... , but so far I did 300 miles with regular and no problem . I can't see the different's between my regular tank and fuel from the dealer , so far I have 520 miles on'it
Premium is $5 extra at fill up. Why even mess around, feed the beast what she wants!
I have lived by those words!
2006 LS430 Blue Onyx Pearl and Cashmere leather interior, Modern Luxury package with Sirius Satellite radio, Smart Access, and Sport Tuned Suspension Package with Chrome 18's.
2014 GX460 Starfire Pearl with Sepia, Driver Support Package, Rear Entertainment System, Trailer Hitch, and Preferred Accessory Package.
I would not short-change such a nice vehicle. An analogy would be to have a 5-star meal accompanied by a $10 bottle of wine. Just give it the recommended fuel, drive and enjoy the vehicle instead of worrying over saving some money when you have already bought a "luxury" ride.
Does it really make a different? Try it and conclude yourself? Even at $8/tank if you pump twice a week it will add up. Shell Premium 91 is $.55 per gallon more than Shell 87 here.
Ever wonder why 2010 and 2011 RX350 recommended (not required) Premium but 2012+ RX350 recommends Regular? Same for the ES line.
The 4.7L in the GX470 is the same as the 4.7L in the Tundra and 4Runner but the Lexus asks for Premium while the Totoya asks for Regular. Same thing as 4.6L in Lexus and 4.6L in the Tundra.
Premium MAY help the engine running smoother and Lexus wants its customers to feel that way (at the customer's expense).
2010 RX350 AWD Matador Red Mica, HID, Navi
2012 Tacoma DCLB TRD Sport 2010 RX450h AWD Obsidian/Black, LED, Navi - Sold
2007 IS250 AWD Matador Red Mica, HID, Navi - Sold
2011 Camry SE - Sold
2002 4Runner Sport Edition 4WD - The BEST vehicle I have ever owned.
There was issue with 2007-2010 Toyota FJ Cruisers in which Toyota initially recommended premium fuel for the vehicle. Members of the FJ forum began hassling Toyota about the reason for this since the Tacomas and 4Runners used the same engine but used regular fuel. Toyota eventually sent out an e-mail stating that FJ Cruisers for those model years would have no issues using regular fuel.
That being said, I have always used premium fuel in my 2007 FJ Cruiser. There are members of the FJ forums that use regular fuel, but noted a decrease in engine performance and power loss. It's not significant since some FJ owners can live with that, but it is noticeable. I'd rather use my engine's full potential.