I recently had just 8 ounces of Dektol left and wanted a print. So I diluted 1:5 and developed for 6 minutes.
Both prints same batch of Galerie 3 and same roll of 35mm film (so black border would match). Both lightly Selenium toned.
The difference could be attributed to two differences I see: greater dilution - or the greater net exposure on the denser print.
Black Border Density: 1.58
Base exp: f/11 32 seconds
The previous print done normally in Dektol 1:2 for 3 minutes:
Black Border Density: 1.88
Base exp: f/8 25 seconds