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Old 31-05-2012, 07:54   #1
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Gallons per Hour Calculation

My brain is tired today, so is this right?

Say twin engine boat going slow does this

goes 16 miles uses 8 gallons at 6 miles an hour is 2 mpg.

Is the gallons per hour is 2.67??
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Old 31-05-2012, 08:01   #2
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Re: gallons per hour calculation

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Originally Posted by sdowney717 View Post
My brain is tired today, so is this right?

Say twin engine boat going slow does this

goes 16 miles uses 8 gallons at 6 miles an hour is 2 mpg.

Is the gallons per hour is 2.67??
No, it's 3 gallons per hour. (6 miles in one hour @ 2mpg uses 3 gallons)
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Old 31-05-2012, 08:08   #3
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Re: gallons per hour calculation

I would have thought 3 gallons per hour
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Old 31-05-2012, 08:08   #4
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Re: gallons per hour calculation

DotDun is faster than Wotname
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Old 31-05-2012, 08:10   #5
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Re: gallons per hour calculation

Thanks for that

Then does this make any sense?
change the numbers but intuitively seems wrong
boat goes 16 miles uses 8 gallons at 30 miles an hour equals 2.0mpg

30/2 = 15 gph ?
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Old 31-05-2012, 08:24   #6
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Re: gallons per hour calculation

Correct!
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Old 31-05-2012, 08:30   #7
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Re: gallons per hour calculation

....and beats the competition to the punch this time.
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Old 31-05-2012, 08:32   #8
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Re: gallons per hour calculation

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Originally Posted by sdowney717 View Post
Thanks for that

Then does this make any sense?
change the numbers but intuitively seems wrong
boat goes 16 miles uses 8 gallons at 30 miles an hour equals 2.0mpg

30/2 = 15 gph ?
Intuitively it may reside in the mind of the beholder
For me, if I use 8 gallons and I expect 15 gph, I think I must have travelled a bit over 30 minutes. Therefore at 30 mph, I must have travelled a bit over 15 miles in that time so 16 miles seems to be intuitively correct

Maybe after a nap, this will seem better for you
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Old 31-05-2012, 08:33   #9
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Re: gallons per hour calculation

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....and beats the competition to the punch this time.
Now where is DD
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Old 01-06-2012, 15:23   #10
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Re: Gallons per Hour Calculation

16miles/6mph =2.6667 hours.
8gals/2.6667hours=3gals/hour
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