Dash Board A/F ratio readings are they accurate?

[1BAD454SSv2]

Doing some initial testing before modding begins on my 2019, i was watching Charge air temps and A/F ratio readings. The A/F is it accurate? A/F at idle and cruising seem to be 13.9 14.0 14.1 . My 2010 raptor stays around 14.7 +/- 1. Also when i started getting past 100mph air /fuel dropped to 10.0 before it hit limiter. Seem super rich. Just wondering what everybody else is seeing on A/F ratio's ? Also manifold air temp peaked 150 degrees for few seconds then dropped a tad till i let out of gas pedal. It was 100 deg ambient.

 

[im33303]

Its pretty accurate.
All your readings are just fine. 14.1 is the stoich reading from factory assuming 10% ethanol
Going 10 AFR is due to Cat Over Temp must probably from my obsrevation.
Stock intercooler will be heatsoaked in matter of seconds. thats why you are seeing those high Manifold Charge Temp

I am using HPtuners for logging and tuning

 

[1BAD454SSv2]

Interesting , so is the truck actually reading alcohol content and adjusting A/F ratio ? If i run some e30 will it adjust?

Found this blurb on google

14.7 AFR was correct, but it is calculated at Stoich. Stoich for gas is 14.7 AFR. Stoich for Ethanol is ~9.00AFR. That means that Stoich for E10 would be (14.7 x 0.90) + (9.00 x 0.10) = 14.13AFR

 

[im33303]

Here is a snap shot from the stock OEM file