My 2003 RX300 was converted at 64,000 thousand and is now on 91,000. Tank takes £35 to fill at current price and does 260 miles on that tank when on motorway run, around 230 around town. Yes, the EML comes on but recent exhaust gas tests show that it is ultra clean on both petrol and log. That light is so sensitive I wouldn't be surprised if it came on if a headlight failed !!