OK, I'm new to Supras. BUT, I am Very familiar in Toyota 4 and 6 cyl trucks.
With those, if everything seems fine, but MPGs drop considerably, replace the O2 sensor. Might not even throw a code, replace it anyway. Your system is adding more fuel to the mix because it isn't reading right anymore.
Best place for a (real - OEM) Nippendenso O2 sensor with best price.....
SparkPlugs.com.
Other sensors from generic parts places sensors' aren't long enough to really get into the exhaust stream for a good reading. Go Denso man!
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