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[Terbs]

Took the Omega out today, longest trip since taking it to James for the belt renewal two years ago. Went from Brackley to Odney (Cookham)…….left Brackley with a range of 255 miles, and at Wycombe the range had increased to 355 miles 😳. Is this normal for a 2.6 driven at a steady 70 mph. Seems to be pretty economic at that speed. I said to Swimbo, at this rate we could get to Scotland !!!😀

[Dave_G]

At that speed, and the way I drive, I would be looking at 32-35 mpg.

So could be normal for me!! Less in town of course.

[Terbs]

I’ll check the mpg on the way back…..😀

[Doctor Gollum]

I’ll check the mpg on the way back…..😀

It will be less because it's uphill

[YZ250]

.......
left Brackley with a range of 255 miles, and at Wycombe the range had increased to 355 miles 😳. Is this normal .........

In my 3.2, I never once saw the range go over 300 to start with, let alone get higher,  and when I was driving, the range would drop in multiples of ten. Do you think that there was something wrong with it.   

[Doctor Gollum]

.......
left Brackley with a range of 255 miles, and at Wycombe the range had increased to 355 miles 😳. Is this normal .........

In my 3.2, I never once saw the range go over 300 to start with, let alone get higher,  and when I was driving, the range would drop in multiples of ten. Do you think that there was something wrong with it. 

Wrong gearbox.

All three of my 3.2 manuals were capable of 430 on a late night run to Norfolk and back. Could just do the round trip on a single tank...

More judicious use could get down to 280, but 360 was a fair average...

Didn't have my 3.2 auto long enough to care, but 330 rings a bell

[Dave_G]

Here you go Terbs...

Travelled 280, 146 remaining. That's maybe 426 total.
Mind you I think I was wearing my slippers.

[Rangie]

When I was working & had my 2.6 my daily commute was 54 miles on pretty good A roads & I used to average around 35 mpg which I thought was pretty good compared to the Granadas I used to have back in the seventies only used to get around 18mpg sometimes only around 14 on short trips around town.

[TheBoy]

.......
left Brackley with a range of 255 miles, and at Wycombe the range had increased to 355 miles 😳. Is this normal .........

In my 3.2, I never once saw the range go over 300 to start with, let alone get higher,  and when I was driving, the range would drop in multiples of ten. Do you think that there was something wrong with it. 

But we all know that the 3.2 is a bit shit

The superior 3.0, even with a idiot like me at the wheel, could do 500 miles to a tank on a run, if speeds kept under 3 figures.....

[YZ250]

………
But we all know that the 3.2 is a bit shit

  

The superior 3.0, even with a idiot like me at the wheel, could do 500 miles to a tank on a run,

500 miles to a tank out of a 3.0.    Wow, that makes my 286 miles to a tank seem quite pathetic. 

if speeds kept under 3 figures.....

Well yes, if I’m honest, that was the bit that I struggled with, and may have had a slight impact on my range mentioned above. 

[Terbs]

So here is a question....where does it pick the range from...meaning, when I left here it read 255 miles, I've completed my trip, with the range going up to 355 at the highest, but sat on the drive now, it still says I have a range of over 300. What I'm trying to say is, I've done over a 100 miles and have more range than I started with I know I'm tapping on a bit, but I'm baffled !!

[Doctor Gollum]

It's a relatively simple calculation...

Known fuel quantity vs current mpg.

Drive gently you're relative consumption is low so the predicted range is going to be higher.

Higher consumption=lower range.

[YZ250]

It's a relatively simple calculation...

Known fuel quantity vs current mpg.

Drive gently you're relative consumption is low so the predicted range is going to be higher.

Higher consumption=lower range.

Agreed.    So Terbs, before you next fill up, zero the trip computer when on a gentle cruise at a constant speed to gain a high mpg. Fill up, and your perceived range will be high numbers.
Then, next time before you fill up, zero the trip computer as you’re going up hill in a stop/start town drive environment to read a low mpg and when you fill up, your range will be shite. 

In layman’s terms, your Omega had been driven around town, moved on your driveway and was reading a low mpg when you filled it up. The computer based your range on a low mpg from town driving, but when you took it on a longer run, maintaining a constant speed, the computer adjusted the range based on the higher mpg figures from that drive. 

On a side note, the range on my 3.2 wasn’t great as my daily commute was partly busy traffic runs through towns and villages, and partly at high speed runs on a bypass. My average mpg was around 22, so it stood to reason that when I filled up my range was poor. When on an economy run one day, I did manage to achieve an mpg of very late 20’s, but as usual I got bored and blew my new found mpg by giving it large again on the way home. 

[Doctor Gollum]

Obviously a reformed character now

Joking aside, my snafu on TT2 yesterday means I had to fill TPC to commute in it...

200 miles this week and potentially another 300 next week. I need to leave an hour earlier than usual to idle it back and forth in the hole that I can get at least 400 miles out of it.

I'm not optimistic 

[TheBoy]

To actually fully clarify Terbs Q, range is calculated from recent MPG over the previous X miles (I get a feeling X is something like 10 or 15 miles).

So around town, the Range starts to plummet, get it on a 70mph steady, flat motorway, and it will hugely increase.