$.10 per mile for DH after 50-100 miles is pretty much the Industry std for a CV...
It varies wildly, but the most common ones are no deadhead at all, 10 cents a mile all miles from the point of dispatch, or something like 25 cents after the first 50 or 100 miles.
Some will say the carriers who pay anything for deadhead are doing you a favor. Well, yes and no. If eating the deadhead expense yourself makes the load unprofitable, you're not going to take it, so a carrier-paid deadhead is an incentive for you to take the load. It can make the load profitable, which helps you, but it helps the carrier even more by getting that load covered.
Panther just moved to a FSC for all miles from the point of dispatch (National fuel average divided by 15 MPG for vans) rather than the old 25 cents per after the first 100 miles. Doing this makes many more loads profitable for the drivers, and thus easier to get covered by the carrier.
Contrary to popular belief, the carrier has no control over where the shipper is, and if you happen to not be close to the shipper then sometimes significant deadhead will be required. If the load pays enough to cover all miles, great, not a problem, but if the headhead amounts to enough to make the load unprofitable, then you either turn the load down or the carrier pays enough to make it profitable, either by paying part or all of your deadhead costs or in some other additional monies. But if a carrier can get you to deadhead all of it on your own dime without paying you anything, or a token dime after 100 miles, more power to 'em. If the load doesn't pay enough in the first place to where that dime doesn't make the load profitable, ask for enough to make it so, or turn the load down. Easy.