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[Tony H]

How do everybody out there . I have been doing quite a few motorway runs lately, which is something I have not done a lot of in my Miggy. Can anyone tell me what the optimum fuel efficient speed to set the cruise at? I'm not concerned about speed just economy. Mines a 2.5 petrol auto.

[Mr Skrunts]

Does yours have the fuel computer onit?

Your profile says you have an Elite, if so and it's gotthe computer then just set the display to instant MPG.  

[Mr Skrunts]

Obviously hills and weather conditions will make a difference but on my Carlton Diplomat I found the MPG varied on warmer/colder days

[Tony H]

Does yours have the fuel computer onit?

Your profile says you have an Elite, if so and it's gotthe computer then just set the display to instant MPG.  

Yep, I have been experimenting with different speeds but thought someone with prior knowledge may have the info

[Darth Loo-knee]

Does yours have the fuel computer onit?

Your profile says you have an Elite, if so and it's gotthe computer then just set the display to instant MPG.  

Yep, I have been experimenting with different speeds but thought someone with prior knowledge may have the info

I find around 80 mph seems to do well on petrol

[Debs.]

I`ve found setting cruise at 65 MPH gives my 2.5 V6 the best steady-speed economy; tyres inflated to the high-end of the load/pressure range helps very much with M`Way economy too IMHO.  

[TheBoy]

my 3.0, around 70-75ish, the tractor, around 80ish

[HolyCount]

I seem to recall -- back in the petrol shortage days --- the figure of 56mph was bandied about as being the most fuel efficient.

Generally tho -- the most wastage is in trying to get to a cruising speed to quickly and stopping / slowing a lot. Smooth acceleration and slowing will help. A little game we used to play to encourage smooth driving habits  was to place an apple on the bonnet and try to keep it there whilst in motion !!!!

[Elite Pete]

About 75-80 on mine.

[jereboam]

Yeah - 75-80 seems best for my 3.0 auto.  On a run I get about 32 mpg - absolutely amazing, really .  Of course, back and forward to the shops or into town gives a figure of about 17 mpg, which is dreadful

[Andy B]

Yeah - 75-80 seems best for my 3.0 auto.  On a run I get about 32 mpg - absolutely amazing, really .  Of course, back and forward to the shops or into town gives a figure of about 17 mpg, which is dreadful

Tow a caravan for any distance & then you'll know what crap mpg is!!   Just come back from Grassington (Skipton-ish) and although I generally get around 20 mpg, while on the M65 up a long incline the instantanious consumption was hovering around single figure mpg! I was in 3rd gear too!  :-?

[jereboam]

If I ever express a desire to tow a caravan, my children have instructions to book me a place at the nearest euthanasia facility

[Kevin Wood]

I find, as long as you're above about 50 so the autobox stays locked up in top gear, the faster you go, the more it burns. Can achieve 36/37 MPG at a constant 65 or so. Any faster and it gets more thirsty. As said, avoid changing speeds - look ahead and plan lane changes in advance.

Makes for a very boring drive, though. Best to cane it and sod the expense.

Kevin

[Marks DTM Calib]

At 65-70 I get upto 40ish mpg.....the difficult bit is keeping the car that slow!

[TheBoy]

I find, as long as you're above about 50 so the autobox stays locked up in top gear, the faster you go, the more it burns. Can achieve 36/37 MPG at a constant 65 or so. Any faster and it gets more thirsty. As said, avoid changing speeds - look ahead and plan lane changes in advance.

Makes for a very boring drive, though. Best to cane it and sod the expense.

Kevin

In case of my tractor, anything below 70mph, I tend to keep it in 3rd to achieve best economy (and performance), hence why 70-80mph seems to be the most economical speed for that.  Below 70 in D/4th, it is outside of its power range, and seems to use more fuel.