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[Danny]

i reset my computer on mine and threw it up the motorway at 80 on cruise, 3000 rpm, 21mpg on gas

[omegaman2]

averaged a 42mpg yesterday with air con  on at a 60 mile round trip to knockhill

[Martin_1962]

i reset my computer on mine and threw it up the motorway at 80 on cruise, 3000 rpm, 21mpg on gas

I got 25mpg on gas at 85mph

[FRE07962128]

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 !!!!

I agree on both counts (excuse the pun! )

What I would point out as well is once you have set the C/C (at say 65 mph) it is ok on mpg all the time the road is clear, but once you have to brake / shut off the C/C your speed of course falls rapidly.  Then when the road is clear you tap to resume the C/C and the gearbox changes down to accelarate you back up to the pre-set cruising speed.  At this point you are rapidly using extra fuel, more than you would with 'smooth' manual accellaration as Hollycount is correctly advocating.

In my humble opinion C/C is fine on open, uncluttered, motorways for saving fuel, but in other driving conditions it is best to leave off if you want good economy.

[Vamps]

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 !!!!

I agree on both counts (excuse the pun! )

What I would point out as well is once you have set the C/C (at say 65 mph) it is ok on mpg all the time the road is clear, but once you have to brake / shut off the C/C your speed of course falls rapidly.  Then when the road is clear you tap to resume the C/C and the gearbox changes down to accelarate you back up to the pre-set cruising speed.  At this point you are rapidly using extra fuel, more than you would with 'smooth' manual accellaration as Hollycount is correctly advocating.

In my humble opinion C/C is fine on open, uncluttered, motorways for saving fuel, but in other driving conditions it is best to leave off if you want good economy.

I remember,when learning to drive Coaches, years ago we used to stand a cigarette packet on the dash and try to aviod it falling over.

[106rallye]

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

i find 60/65 on the motorway can get about 45mpg. thats with 35psi front tyres and 45psi rears.

i normally get bored tho so my average tends to be about 22  

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.

i dont find keeping it in 3rd helps as the engine braking as a lot more severe, but when accelerating it definitely helps to down change a gear or 2 (it also helps to blip the accelerator to stop the engine slowing the car down between gear changes).

It also helps if you do things like speed up on flats to compensate for any hills coming, draft trucks etc, carry speed around corners, plan overtakes etc.

Also people seem to think that knocking the car into neutral is a good idea but this actually uses more fuel that keeping it in a high gear.

averaged a 42mpg yesterday with air con  on at a 60 mile round trip to knockhill

Were you there for the edc, timeattack? i went n managed an average of 24 (it was 37 when i got there  ) i met an NSX and subaru on the roads back though which kind of spoiled the economy