Normally I run around sea level at home but Iam on road trip in Wyoming at over 5000' elevation I am noticing alot more black smoke when towing. I run a DP tuner with 40 and 60hp tow mode. I also notice alot more black smoke in 60HP Econo Mode when not towing? Would this be typical due to the higher elevation?

 

Yes. There are two fuel maps in Stock tune to compensate for altitude. Tuners don't always use both maps, they just use one map per tune.

 

you sure will, at 5,000" elevation you dropped about 2.5 psi in pressure and dropped about 20% of air density compared to see level. Best to go back to stock setting for now when towing........