Yes T-Max set the tuners a little rich, this is because the fuel setting HD uses of a 14.7 AFR is considered lean which will create more engine heat. The T-Max tuner AFR is set around 13.5 which is a richer AFR but the engine will run a bit cooler.
I get around 35+/- mpg on my bike which is a 103 and I find this to be OK with me.
Do a few riding sessions and a few auto tunes and see what you end up with and if you still want to get better mpg than there are adjustments that can be made.
Remember a base map is just a platform to start with and some adjustments may have to be done for everything to be just right.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.