fuel gauges

[andreworiordan]

I'm looking to get the most out of my fuel when out, Now I know that I cant say too much next to those of you who would have significantly larger engine but still want to get the most for what I have, I currently have a 2004 Mariner 40hp 2 stroke XRNLI engine, I want to know what kind of fuel I'm burning at different revs, I have been looking at different fuel gauges like the NAVMAN Fuel 2100 System, however it says that it is from 50hp and up, I don't want it to only work when I'm flat out, is there anything that will tell me how many lt/hr I'm burning at different speeds on the market? not looking to spend huge money on this as id rather spend it on the fuel itself, Is there anything that's for cars or tractors that might fit into the fuel line or something? thanks for your help yet again guys!!
Andrew

[Nasher]

I have a Navman 2100 and am most impressed with it.

I don't see why it won't work on meduim sized engine like yours as it works at very low revs and consumption on my DT200.

If it was inaccurate at low usage then all the average figures for a larger engine would be worthless.

Nasher

[jyasaki]

The lowrance fuel management thingie (same theory as what you're looking at) registers down to about .2 gph on my F115.

I don't see why they limit their market to 50hp and above, as even large engines have a fairly small flow rate at idle.

jky

[Grouse]

Anyone know where you can get a good deal on one of these at the moment?