Okay, took the truck out on a pretty flat stretch I finally found that will work for testing. It was 68* OAT when I started, and was 65-66* when I finished.
Still need to troubleshoot what I fried on the VSS side of my MPGuino
, but the fuel flow still works...so I made voice recordings of my stops and starts and set my usec/gal to a ridiculously small number so it looked like I'd burn about 0.3 gal/mile.
Only problem with voice recordings was my Palm Pilot was picking up all kinds of background noise. Next time, I will use my iPhone with the Apple earplug setup--it has a mic built in and you can squeeze it to start/stop. I tested it today, and it does a much better job filtering background noise...
Anyhow, from what I've been able to filter out from my recordings:
First series: AIRRAM air scoop, cardboard ducting direct into OEM air filter box.
IAT 71-73* 6 passes (3 each direction), threw out high and low. Avg: 19.86 mpg
Second series: taped cardboard in front of AIRRAM air scoop (in front of grill), zip-tied flexible 4" dryer hose from radiator fan shroud over and into the OEM airbox.
IAT 89-91* 6 passes (3 each direction), threw out high and low. Avg: 20.97 mpg
Third series: AIRRAM air scoop, cardboard ducting direct into OEM air filter box.
IAT 71-73* 6 passes (3 each direction), but I can't discern my voice from the background noise just yet. Will update when I can. I only deciphered the first run: 19.51mpg, identical to the first CAI run. Otherwise, way too much noise. Even noise removal doesn't help. Sigh.
However, I wanted to see if my mpg change reads okay to you all? True, with the WAI I did have a little more (1/8th) grill block. I was pretty surprised to see a 5% mpg increase though. I do recall somewhere around 80-90* IAT my truck seems to lean out slightly; at least that's what I remember from driving around north Texas the past two years. Thoughts?
 Cruise control set at 61 mph. It pained me greatly to drive back home, leave the truck idling while taping cardboard on the front or removing it. I dislike idling...but wanted to keep the exact same cruise speed. Winds were out of the south at about 7 mph, a crosswind on the road.
I did the math and it seems I have a 6.6% increase, not 5%. Seems consistent with other MAP vehicles: WAI A-B-A test (design and execution)