Motorists and airline passengers aren't the only travelers thinking about high fuel prices as summer vacations near. Recreational boaters are feeling a pinch from the Iran war too. The ethanol-free gasoline that many boats prefer is even more expensive than regular gas. So is diesel fuel, which also powers some boats. The National Marine Manufacturers Association says its conversations with boaters indicate that most still plan to head out on the water this year but fuel costs are curtailing some people's plans. Businesses like fishing charters are deciding whether to add fuel surcharges to make up for their higher costs.