Renault Laguna II - Phase 1 - Engines - Average MPG from 1.9 DCi Engine - Page 10 - Renault Forums :: Independent Renault forum

View Poll Results: What is your avarage MPG?
0-10 MPG 1 0.06%
11-20 MPG 6 0.38%
21-30 MPG 85 5.32%
31-40 MPG 498 31.14%
41-50 MPG 868 54.28%
51-60 MPG 116 7.25%
61-70 MPG 15 0.94%
71-80 MPG 1 0.06%
81-90 MPG 1 0.06%
91-100 MPG 8 0.50%
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post #46 of 380 (permalink) Old 10th May 2006
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I've had a tinker round with this converter here

http://www.pege.org/fuel/convert.htm

Assuming that the figure is calculated as l/100Km to one decimal place before conversion, then the resolution's down to about 1.6mpg by the time you hit the 60 mark Not that I've seen 60mpg out of it yet, though I did manage 51.3 on the way home

And 51.3 doesn't convert into a round number of l/100Km (4.5852 ish according to that page) so I really can't fathom how they're calculating the economy figures.
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post #47 of 380 (permalink) Old 10th May 2006
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Quote:
Originally Posted by Horatio
I've had a tinker round with this converter here

http://www.pege.org/fuel/convert.htm

And 51.3 doesn't convert into a round number of l/100Km (4.5852 ish according to that page) so I really can't fathom how they're calculating the economy figures.

I agree with you. Computers have a funny way of doing sums! 4.5852ish is probably rounded up to 4.6 that's why the l/100km readouts "look" better.

I think it is what's known in the trade as "cooking the books", "pulling a fast one" or "taking the p1$$".



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post #48 of 380 (permalink) Old 10th May 2006
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Just did a 340 mile round trip to Glasgow today, which is my first real run out since buying the 120bhp version. It returned a very good 54.3 miles to the gallon. Iwas very pleased with that.
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post #49 of 380 (permalink) Old 14th May 2006
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The plot thickens. I did a run into work, still on the BP diesel and only managed my usual 42'ish. Then filled up with Shell Diesel Plus (or whatever it's called) and managed a fairly disappointing 47 on a relaxed run to Blackpool. So I reset the trip on the A55, and did the steady speed run for a few miles, and once again I was getting 50+.

So maybe it's not the fuel, just that even moderate changes in speed (even without braking) can have a seriously detrimental effect to fuel economy. I've always looked at braking as being a waste of fuel (you've used fuel to build up inertia, and are now throwing it away as heat through the brakes) but would have thought that gentle acceleration and deceleration (without braking) wouldn't have that much of an adverse effect on economy.

Obviously I was wrong.
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post #50 of 380 (permalink) Old 16th May 2006
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Mpg

All,

I do 1000 mile a week in my ST 1.9dci. I get a sold 44.1. This is mostly 80'ish mph motorway and 2 hrs of sold stop start traffic. Car has now done 96K.

I find no difference in Supermarket and Brand fuels though I always use our local Tesco's which I always thought was supplied by Esso anyway.

How can I tell which bhp engine we have?

Kind Regs

Bobby
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average , dci , engine , engines , laguna , mpg , phase , renault

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