No impact. 'Course my little diesel is miserly when it comes to fuel consumption. I have noticed a reduction in powerboat traffic and a lot of 'em seem to spend more time at anchor, swimming off the transom rather than running up and down the Potomac.
These fuel prices must be killing the working fishermen and charter boats though. My brother has a twenty three foot skiff and heading offshore for the day trolling for dolphin now costs about four hundred dollars in fuel.