Gota agree with the E3 fans. 23,100km/14,300mi with approx 5 mm tread left on current E3s. No noticable cupping or abnormal wear yet.
They handle well with 2up and have taken a lot of abuse over the past 13 months, including a 7 day heat wave we survived from Texas to Death valley last July.
(one of the days they predicted a record high of 130f for death valley)
This is the second set for this bike. Not sure how many mi on the first set, but didn't have any isssues with them.
The thing is, the cost for a set over this way is prohibitiive, about $610 a set all in. ouch.