2013 wrx bought in sept
Stage 1 in around jan i think
Stage 2 in feb
6k miles. Avg 19 per gallon city/freeway
I was avg 21 on 91 but no ethanol (michigan gas)
Flashed back to my 93 stage 2 custom and was averaging 19. Warm ups take about a few min but you just watch that avg drop.
Just drive the car and pump you need gas. Your taking it everywhere w you and again its a car that doesnt advertised for gas efficient. Buy an impreza or a prius if you want to save gas money.
Oh if you think oh stage 1 stage 2 could save you gas... HA your dead wrong