Thanks for this tip. I have the same cup holder and am annoyed by the splatter of soda that comes out and goes everywhere with the stock straw.Here is an up grade tip for the cup and straw. Take the straw that came with the cup to your local hardware store and find some clear tubing that fits over the the straw tightly, get about 12 to 18 inches of it, leave it on the straw and the free end put over the vent tube on the lid. When you want a drink just get the end from the vent, when done raise the free end and the water /drink drains back into the cup or just blow a little back down the tube and put the free end back over the vent.
No need to be leaning over or taking the cup out of the holder while going down the road to get a drink. Been doing this for years. We replace ours extensions ever year and rinse them out every so often during the riding season.
From the Northwest Corner.