Our design team suggest you use grout colour 08 Cement as a complimentary shade for a blended look.
Kerakoll Fugabella Color Grout 08 Cement 3Kg – Baked Tiles
Recommended Grout Joints - We have assumed that your substrate has a perfectly flat and plumb surface, please check with your tiler.
3mm grout joint. Based on this joint size, 1 bag of grout would cover 10.8m².