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Gas usage math formula?


Greetings Fellow Carver Owners...

My twin engines are Crusader 350 XL HT's I have been renting my boat out to a captain taking his family out for four hour blocks. Mostly he's been filling the tank back up to where it was before taking the boat out. If he happens to run out of time to put gas back in does anyone have a formula I can use that can ballpark how much he owes me for gas?

I thought of noting engine hours before & after...then using an average RPM of 2500 burning 25 gallons of fuel and multiplying times dock fuel rate per gallon???? It's mostly just cruising around San Francisco Bay...

Any thought or ideas???

Thanks,

Rick

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