[quoteIMO, you can not always trust electronics, the sensors get tainted quite easy.
If it were mine I'd richen it up some just to see. [/quote

If u cant trust a LM-2, what can u trust?

Ive had 2 motors in the car the last few years.- Run on gas and E85. Warmer on the hwy with both fuels, and 4 different carbs. AFR all over the map, no change in the issue.

I think as mentioned above its the shroud/fans restricing air flow at hwy speeds.