Not sure if this makes sense or if possible but here goes. We always rent a car, never thought of NOT renting a car. But this year we are going to US/IOA for a day (straight from MCO) - and then to WDW the next day for 6 days
Would it make sense/possible to take mears from MCO to UN and then next day from Univeral (Un) to WDW and then take Magic Express to MCO at end of trip?
Would this qualify for Mears 19.00 Round trip pp? Or is it not considered a round trip? We are a party of 3...thanks!
i have read that some have used the Mears transportation that way.
they purchased round trip but did not use them on the same day.
call and clear it with them if they are still allowing that.
dreams unlimited did allow transportation broken up like you need.
peeps that used du for their uo tickets also received their free transportation.
if you don't buy your uo tickets from du, check with them about the transportation they offer to uo.

and I've been thinking about just using a taxi. I don't want to rent a car bcuz I don't want to pay for parking at Universal. That just adds to the expense. I booked 1 night in the middle of our trip at HRH for the early entry & FOTL access and was just planning to bring either a carry-on size duffle or a backpack with what we need for the 2 days at Universal. We are going from BWV to HRH & I got an estimate on the Mears website for $35 for a taxi. Since I read that Mears doesn't allow "luggage" and to save time by going directly to the HRH I thought for the 3 of us it might be just as easy to use a taxi as it would the shuttle (even though it may cost us $20 more it would be a straight shot with no other stops or detours). 
We will just leave the duffle with bell services.