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Old 10 April 2007, 10:55   #1
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What's Your Fuel Economy?

Roughly how many litres do use per hour at cruise speed?
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Old 10 April 2007, 11:10   #2
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anywhere between 1.2 and 2.7 depending on how much fun I am having
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Old 10 April 2007, 11:23   #3
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I average on a trip anywhere between 1.3l/Naut Mile and 2.1l/Naut Mile depending on lots of things. Its probably loads more for short periods.

The big guzzler on my set up appears to be If I have to do a lot of milage at displacement speed.
But also.
How much Fun I'm having.
If I'm towing a ringo.
How much weight I'm carrying.
Sea State.
Etc
Etc.

Some examples

All approx from memory.

Return trip Northney marina North Hayling to The Folly IOW.
Down through Chichester Harbour at 6 – 8 knots.
Cross the Solent to Cowes at ave 25 to 30 knots.
Up river to the folly at 6 knots
Back the same way.
44 nm and 87l of unleaded 1.9l/nm

Return trip Portsmouth Camber to The Folly IOW.
Short distance through Portsmouth Harbour at 6 knots.
Cross the Solent to Cowes at ave 25 to 30 knots.
Up river to the folly at 6 knots
Back the same way.
20 nm and 32l of unleaded 1.6l/nm

Return trip Hayling Island Ferry Inn to Cowes Town Quay IOW.
Short distance through Langstone harbour at 6 knots
Cross the Solent to Cowes at ave 25 to 30 knots.
With bursts of higher speed.
Short distance to Town quay at 6 knots.
Back same way
26 nm and 39l of unleaded 1.5l/nm

Towing ringos around in Devon
Too scared to work it out.




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Old 10 April 2007, 11:24   #4
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Quote:
Originally Posted by qcamel View Post
anywhere between 1.2 and 2.7 depending on how much fun I am having
Litres per hour?!

Depends on weather and speed-between 10 and 15 litres per hour cruising-going up to about 23/24 when I'm feeling psychotic
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Old 10 April 2007, 11:30   #5
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At 30-34 knots 1 litre per mile per engine

35-44 knots about 1.2l per mile/per engine

45-56 knots, 2.5 litres per mile per engine

Natually when the misses is on board 20 to 55 knots it uses about 1 litre per mile
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Old 10 April 2007, 11:31   #6
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Quote:
Originally Posted by Nos4r2 View Post
Litres per hour?!

Depends on weather and speed-between 10 and 15 litres per hour cruising-going up to about 23/24 when I'm feeling psychotic
Gulp I have seen about 85 on mine - cruising is a lot better though!!!
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Old 10 April 2007, 11:33   #7
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Quote:
Originally Posted by Nos4r2 View Post
Litres per hour?!

Depends on weather and speed-between 10 and 15 litres per hour cruising-going up to about 23/24 when I'm feeling psychotic
My mistake, meant per NM, although per hour would be less painful on the wallet
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Old 10 April 2007, 12:13   #8
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Phew!

Litres per Mile!!! Can't tell you how much better all that makes me feel. Here was I thinking I was hard done to at 1.6 Miles per Litre at cruising speed (23knts).
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Old 10 April 2007, 13:24   #9
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These are the numbers I was estimating....Looking at probably a 5.3 length with a 90hp so I am hoping for around the 1.6l per nm mark
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Old 10 April 2007, 14:28   #10
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0.7 litre per nauticle mile doing 25-35 knots using the 1.7 litre mercruiser diesel in a 6.5 metre rib.

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