Last post on Nov 10, 2012 at 11:10 AM
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Lexus ES 300, Lexus, Fuel System, Sedan
#1 of 2 Premium vs. Regular?
Nov 05, 2012 (1:18 pm)
I just got a '97 Lexus ES 300 that requires premium unleaded fuel (91)- according to Lexus. The gas cover only says unleaded fuel only. Can I get away with using regular only? Anyone have experience with this? Thanks!!
#2 of 2 Re: Premium vs. Regular? [dgal]
Nov 10, 2012 (11:10 am)
By 2001, with fair certainty, the majority of manufacturers of "high compression" engines had revised the EFI engine control firmware to use a slight A/F mixture enrichment to alleviate the requirement for premium fueling, including my '01 Porsche C4.
Accordingly most owners manuals now ony say "premium fuel RECOMMENDED" for maximum engine performance. Latter meaning higher HP/torque, FE will be so close to equal as to be insignificant.