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The important question is how many gallons per hour does your motor use at cruising speed? Without that info, you can not solve this equation. Total Fuel Capacity / Gallons burnt per hour at cruising speed = Total Time Cruising Range in Miles = Total Time (hours) x Cruising Speed (mph) Example : 79Gal Fuel Tank / 10Gal per hour burn rate = 7.9 hours. If the cruising speed is 30mph, then 7.9 hours x 30mph = 237 mile range

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Q: How far can a boat with a 8.1l Mercruiser 375hp go with a 79 gallon fuel tank cruising about 30 miles per hour?
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