13.5 mpg?

[Staceman]

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!