Maths experts....calculating mpg

What does start range projected mena?

Thanks for asking......

The computer calculates how many miles can be covered, based on fuel remaining, and taking into account consumption, at any point of time.

If for example you drive 10 miles at a steady speed of 60 mph in top gear on the A1 your gauge will calculate that you can do say 200 miles with the fuel left. If you then enter a town start using lower gears, go slower, starting, stoping whatever, your gauge will then recalculate going off your current driving conditions and you will find your 200 miles is now only say 140.

Exactly, and it can go the other way, so your projected mileage goes up, even though you just drove five miles.

I still don't know if mpg can be calculated from the info I posted at the start!

That was my point. When you have started your journey and looked at your miles you must have then drove more economical and it has recalculated and is telling you that driving as your driving now that’s how far your fuel will take you. Jump in the car on next journey and red line it in every gear and it will recalculate again and tell you that you can only go 30 miles instead of your previous projected 120

Anyway unless your driving a shed your car will also tell you your average or current mpg

Yes, of course it does (doesn't any shed)?

When I was working I was doing circa 35k miles pa.

Now I do less than 3k miles pa as it's mainly local.

The figures quoted were for a 26 mile cruise, of mainly A roads and motorway,
so I'm just curious as to what might be the best possible mpg.

I'm not that bothered, as five of my last seven cars did, at best, low twenties!

On a dry day, weigh your car at the beginning and end of your journey and divide the difference by the SG of your fuel. That will give the volume consumed (assuming that you haven't used the screen washer en-route).

I've been tracking my MPG for years; it keeps me in touch with how the car is running but like LFV my mileage is relatively low these days.

How I track is by putting in a full tank, resetting the trip meter to zero and then calculating what I use next time I fill up and again resetting to zero. Simple maths does the rest.

Average MPG since I bought the car in July 2016 is 37.35
Average MPG on long trips (1 hour or more) is 40-42
Average MPG local is 32-37
Cost per mile ranges from 12p to 15p

1.6 Fiesta

A notable factor is that winter driving is more costly with a lower MPG than in the summer, hence the wide variation in local MPG

Have you factored in the melted milky way mass/drag coefficient?

I do the same, Aspro. My driving is mainly in urban traffic and works out at around 4 miles per litre.