63 MPG! Well impressed!

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rwb
3.0 24v
Posts: 2501
Joined: Thu Jun 17, 2010 7:53 pm
Location: Yorkshireman exiled in Salop
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Re: 63 MPG! Well impressed!

Post by 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.

R-plate 406 1.9 TD LX (1 year) | 02 406 2.0 HDi (90, Siemens) GLX+nav (8 years) | 07 407 2.2 HDi GT (since 2013) | 307cc 2.0 180 | Map of PeugeotForums users offering PP2k

frog
2.0 16v
Posts: 122
Joined: Sun Aug 24, 2014 12:18 pm
Location: Netherlands

Re: 63 MPG! Well impressed!

Post by 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 - 7 seater
2001 Citroen Saxo 1.6i 8v 100

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

PP2000 user, can help with faults / diagnostics in the Netherlands.

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