Save your money. Everything I have read and trying the 89 octane for years makes absolutely no difference. The fuel companies think so but in actuality your truck will run just as well. In fact it is designed to run on 87 octane rated fuel. Actually the octane rating really reflects the anti-knock properties. I do know that the only engines that benefit are super high performance engines that have much higher compression ratios. <img src="/forums/images/graemlins/kewl.gif" alt="" />

03 Double Cab TRD.. ARB, warn winch, OME coilovers, Alcan leafs, Bilstiens, Sky E-locker guard, etc, bla bla bla