rmaugans

My 2003 RX300 uses 87 octane with no problems. Like most, I stared using the premium stuff as recommended, until gas hit $4.15/gal in 2005. Out of necessity I switched to 87 octane regular (at Krogers no less)and have had no regrets. Just changed the spark plugs at 110,000 miles and they looked fine. Engine runs like a clock. Why waste your money on highly branched hydrocarbon chains if you don't need to? I'd invest in more frequent oil and transmission fluid changes. For me that is 5000 and 50,000 miles respectively.