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Maybe the 4th of Feb was colder then on 11th
So, this is going to be anecdotal, because this trip is an out + back commute combining morning plus early evening. There *might* have been a few degrees in it, but not sufficient to account for the difference in efficiency (IMHO). Heating / pre-heating was not used on either trip.
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PS: 229km at 71km/h .. you must have lot of patience ... speeding up a bit might cost more fuel, but also save 1h or more of "life"
This commute is approx 40 miles (65km) motorway / dual carriage; 12 miles (19km) single carriageway and the remaining 8 miles (13km) city roads (same on the way back, funnily enough!). The inner city section can take 30 to 40 mins on a morning, thus reducing overall average. However, I have been experimenting a lot with increased speed vs time saved vs extra fuel taken. On the 40 mile section of motorway, travelling at 70 mph whenever possible, average speed increases to about 58mph for that section, vs 54mph when cruising at 60mph. On this section of motorway, that equates to approx 7 minute time gain. I can't recall the exact figures, but I seem to recall that the cost of extra fuel was about £2 for that increase in cruising speed which, in my book, is not worth the extra 7 mins!
To check my figures, I have repeated this 'style' of drive yesterday and today and am seeing between 5 mpg and 10 mpg difference between Eco and Normal running.
I am going to really put this to the test in about a weeks time when I head to France, a trip of about 1200kms, a trip I have done many times and so can compare.