Several threads already on MPG.
I was getting about 18-20 before installing my TRD CAT Back. I consistently now get 20-22mph. I drive 70 miles a day to get to work and I go up a 1000ft "mountain" pass every day. I'm in California stop and go commute both ways. I reciently got a ScanGauge II as well and my math for MPG was confirmed by the ScanGauge. Today I actually got 21mpg on the way to work and 23 on the way back. The grade is longer downhill on the way back
. Tank average the last two tanks has been 21mpg. Tank average MPH this time round also has been 40mph. Do about 60 up the grade and about 75 down. The rest is dependant on traffic.