I just sold my 2012 2520xld with the 300 and bit the bullet and purchased a 2019 2820xld with twins. I did many offshore trips with my 2520, approx 40-60 miles each way. fully loaded, four guys, 50 gal livewell, 180+ gal of fuel, ice etc. and the fact was, It was a bitch to get her on plane. I had four different props and always had the same problem. my fuel economy was closer to 1mpg than 1.5. The motor was impeccably cared for but did have 1100 hours on her. From what Ive heard Parker is steering most folks to the twins vs the single 300. because of this problem on the xld. I've been told but don't know for sure that the twin 150's because of their location will get the deep v out of the hole much better than the single 300. Don't get me wrong, my 2520 was a great boat and with a normal load she did great, top end around 36mph. it killed me to let her go, but planning was a real problem with a full load. Don't mean to chime in, just found this site and figured id throw my two cents in for what its worth.