It may seem more efficient to crank the grill up to its highest temperature, but when you’re cooking grilled chicken, Brian Jupiter, executive chef of The Frontier Chicago and Ina Mae Tavern in Chicago, says “the best way to keep grilled chicken from drying out is to grill at a medium to medium-high temperature. Oftentimes, grillers are overzealous about how hot the grill needs to be and turn it all the way up. By using a lower temperature, you can still get your grill marks, but with a more consistent cook.”
Article source: https://www.huffingtonpost.co.uk/entry/how-to-make-perfect-grilled-chicken_uk_628f9676e4b0edd2d020ae48