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406oc.co.uk • View topic - 63 MPG! Well impressed!

63 MPG! Well impressed!

Just your normal general chatting in here..

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Re: 63 MPG! Well impressed!

Postby rwb » Wed Jul 26, 2017 7:30 pm

The 407 2.2 petrol did 20mpg when used as a shopping trolley, but I got 46 out of it on my usual run.

It certainyl does depend on temperature. I offer the following two hypotheses:
(1) the car over-fuels itself when it's cold to try to warm itself up, and
(2) when the air is cold there is more of it in the cylinder and therefore the map allows more fuel to be injected.
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rwb
3.0 24v
 
Posts: 2491
Joined: Thu Jun 17, 2010 7:53 pm
Location: Yorkshireman exiled in Salop

Re: 63 MPG! Well impressed!

Postby frog » Fri Jul 28, 2017 3:03 pm

I have two other hypotheses to offer: :D

(3) Winter fuel has anti-freezing/-waxing/-clogging additives, making it less efficient
(4) Colder air is denser, giving more resistance while driving.
Current "fleet":
2003 406 Estate 2.0HDi 110 (109 PS) - 7 seater
2001 Citroen Saxo 1.6i 8v 100 (98 PS)

Previously owned:
2000 406 Sedan 2.0 HDi 90 (90 PS)
2000 406 Coupé 2.0i 16v 138 (135 PS) - Riviera Blue

PP2000 user, can help with faults / diagnostics in the Netherlands.
frog
2.0 16v
 
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Joined: Sun Aug 24, 2014 12:18 pm
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