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MOzS90 · May 5th, 2018, 07:36

I am pretty OCD about economy and lots of things make a difference other than the obvious heavy feet and traffic jams.

It is true that colder temperatures affect diesel and you’ll always get worse numbers in the winter months. It’s amazing just how much difference wind makes to (I live in N Wales therefore an expert on head and tail winds!!!) - a decent tailwind can be up to 5mpgs better than a headwind (just go cycling in a strong wind and see what i mean).

I have a very friendly economy commute of 42 miles of dual carraigeway and managed 70.6mpgs (according to the car so not that accurate) the other day with about a 20kt tailwind and 10 degs outside air temp. Similar conditions going the other way (about 2 degs cooler) was calculated at about 63mpgs.

Increasing speed above 60-65mph has a huge impact on economy too.

May 5th, 2018, 07:36	#3
MOzS90 Senior Member Last Online: Feb 7th, 2020 22:15 Join Date: Mar 2018 Location: Utopia	I am pretty OCD about economy and lots of things make a difference other than the obvious heavy feet and traffic jams. It is true that colder temperatures affect diesel and you’ll always get worse numbers in the winter months. It’s amazing just how much difference wind makes to (I live in N Wales therefore an expert on head and tail winds!!!) - a decent tailwind can be up to 5mpgs better than a headwind (just go cycling in a strong wind and see what i mean). I have a very friendly economy commute of 42 miles of dual carraigeway and managed 70.6mpgs (according to the car so not that accurate) the other day with about a 20kt tailwind and 10 degs outside air temp. Similar conditions going the other way (about 2 degs cooler) was calculated at about 63mpgs. Increasing speed above 60-65mph has a huge impact on economy too. __________________ https://imgur.com/a/c17X9 Last edited by MOzS90; May 5th, 2018 at 07:40.