hit the 1/4 tank mark at 320miles. Which is a little high. Especially that i've been driving mostly street. I usually hit the 1/4 mark at 280-300miles and that is with mostly freeway.
I go faster now and drive the streets more and still my mpg is climbing. Things I changed during the mid of this tank... 1) new air filter, 2) New air hose, 3) front tires at 44 psi and rears at 41psi.
This tank should be high 27/low 28's. I think it's possibe to break 30mpg mixed without tuning. But to get to my 35mpg mixed goal I need tuning. I still have to run auto-rx, finish belly and put it back on, and do pcv catch can.
Talked to a couple of people who know their stuff. If I lean it out the ecu will just add more fuel to get back 14.7 a/f
The only place the engine management for fuel economy would be beneficial would be when the engine is in open loop when it's cold. So basically it's not worth it. If I had a standalone it would be a different story. But since there is still the ECU in the car it's hard to control it. The e-manage is tuned in 500rpm incraments but at least it will give better numbers in power than the safc2.
That is true, after some time the ECU will make adjustments to the long term fuel table and "unlearn" your settings in closed loop. This is why chipping your ecu is far superior to a VAFC, SAFC, E-Manage, etc. Plus you can change your spark also, (I think e-manage might be able to do this now).