Because you are dealing with a very limited amount of power, you may see improvements from aerodynamics with speeds in the 35 to 45 mph range.
Put a medium-size fairing on the handlebars to deflect the air over and around your body for starters. That should give you some improvement, and it's simple.
A tail would help, but I wouldn't say constructing one was simple. I expect it would also show less improvement, by itself, than a handlebar fairing at those speed.
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