DS,inserter DE,Sport Page 362 https://www.bbc.co.uk/sport/formula1/58870237 CT,10,T PN,36200 SC,0000 PS,8000 OL,1,Wj#3kj#3kj#3kT]Rh,hlhl <<4444hl hlhlh$ OL,2,Wj $kj $kj 'kT]Rj#jzj#5555u5ujk jzjjj1 OL,3,W"###"###"###T//-/-,-/....,.,--/-,---.// OL,4,BRed Bull's Christian Horner questions OL,5,BMercedes speed gains OL,6, Red Bull team principal Christian OL,7, Horner has expressed his "surprise" at OL,8, gains he says Mercedes have made with OL,9, their engine performance. OL,11,FUnder Formula 1's rules, the title OL,12,Frivals are not allowed to improve the OL,13,Fpower of their engines in-season. OL,15,FHorner said Mercedes' straight-line OL,16,Fspeed "has taken a significant step OL,17,Frecently". OL,19,F"It's surprising they appear to have OL,20,Fmade the step they have with the power- OL,21,Funit," he added. OL,22,D]CCEEFAX MOTORSPORT SECTION PAGE 360 OL,23,D]CBBC WEBSITE: bbc.co.uk/motorsport OL,24,ANext page BM/sport CHeadlines FSport FL,363,360,301,300,8ff,199