The sensor element was placed at the top-center of the filter, pressed between and held securely by the pleats. The idea being that this would likely be the warmest place in the air collection area.

Stopped at idle for three minutes to allow the engine to finish warming up fully. Temperature climbs very quickly when stationary. A stop at a Taco Bell drive thru maxed out the thermometer at 160 degrees.

A couple of blocks down the road, driving down residential (25 mph) roads and slowing to the first light. About 3 minutes. Temp has dropped 35 degrees. This is typical. Up to 40 mph the hemi is barely above idle.

Stopped at the second light. Speed on this road is 50 mph. temp still falling.

Next light. Temp has fallen further.

Next light. Temp is only 5 degrees above outside now.

I caught every light during this test so these are one-block intervals (Fresno has long city blocks and is laid out in a straight-up NEWS grid.

Ending in-city testing at this point as I have to hit Taco Bell before beginning the trip.

Five minutes after starting down the freeway. Temp is 1 degree above outside. Ordinary behavior is fluctuations of 1 degree at or above outside temp at constant speed on flat ground.

Gunned it up to 85 from about 60 and snapped a picture.

Two minutes later outside and engine are again equal.

five minutes after that... same story.

About 75 miles later its warmer outside. Terrain is no longer flat but uphill, with a hair of acceleration needed to maintain speed.

Gun it up to 90 from 60 and snap a picture. Temp returned to match outside afterwards, as before. Conditions wouldn't allow holding this speed to see if 90mph continuous would eventually equalize to the outside as it does at other speeds.