Originally Posted by Dr. Dyno
The O2 sensors in the exhaust are what normally control the AFR while the engine is running on them in closed loop. So intake air temp would have a slight if any effect on mileage. The only times it runs open loop are at near full throttle and cold startup. Yours was running startup rich with the IAT sensor disconnected. I'm sure you knew all that, but the point is there is no linear relationship between IAT and mileage.
The pinging indicates you are just over the edge of maximum economy. What's really nice on the 4.3s is the ion sensing anti-knock ignition systems that can keep the timing just on the other side of the edge.
BTW, what happened to the pretty face we admired as she admired her RAV? I thought it was all so perfect.
Air intake temp does make a difference on mileage because of the density of air. Less air = less fuel = less power = better economy. It's an instant reaction for RAVadoodle. Raise the IAT and the mileage gets better. I know too much of a good thing, is still too much. Moderation. I think 80F is the best temp to keep her from pinging. I haven't had much time to play around with the air intake stuff. I've got a new project....
And not all vehicles respond well to a WAI (Warm Air Intake). A friend of mine has a Toyota Matrix. He's tried a WAI with no difference to mileage. Now THAT doesn't make sense to me, but results are results.
Thanks for the picture complement. I can put it back on...
I didn't like seeing my face all the time. I don't think the picture turned out very well. It's hard trying to be my own photographer without the use of a tripod! Plus seeing myself without bangs looks silly to me. I was trying something new, but I usually have bangs. Lol...
I've lost 20 lbs since then too. Ya ya... I should just get an updated picture so everyone's happy.
BTW, the Ultragauge costs HALF AS MUCH as the Scangauge II. I paid $86.86 (includes shipping). It didn't take long to pay for itself in fuel savings either, because of my new awareness.
A few months is all! And the savings continues!! Think of all the goodies you could buy with the savings!
And once you learn how to drive even more efficiently, you can choose when to drive that way, and when not to. I still have my days when I can't hypermile. I'm a natural lead foot, and sometimes the thrill of speed is more valuable then fuel.