MPG of powerful engines

or to save doing all that bollocks

cheapskate :D

Because of the APC controlling boost and using the knock sensor, the old Saab 900 16v was 9.0:1, 8.8:1 for the ST185 GT4.

I average around 16-17 mpg around town (which is most of the time), get about 25-30 on a run depending if I'm going quick or not. E34 BMW 535i

Except that they're horribly INefficient !

Remember, they have a huge great restriction in the exhaust (the Turbo), AND a low compression ratio.

Also remember, that you can't spin the Turbo for free. It's energy has to come from somewhere, and if you trace the route back, the only energy source it has is the fuel in the tank. Fuel used to drive turbo = worse mpg.

I've got about a 50l tank in the TI, which I make out to be 11 gallons. Work commute nets me 240miles from said tank, making about 22mpg. That's 9 miles, starting from cold, lots of overtaking, accelerating from 30mph to 90mph etc. - not mpg friendly at all !

On a motorway run at a steady 80mph, then I get 400 miles from the same tank - which is a nice 36mpg.

It all depends on the journey in question.

Or to save unneccessarily complicating things by putting irrelevant conversion factors into the equation:

The basic calculator (built in to mobile phone) method is easy:

Peter

-- "The humble bic biro draws 13 beards, 9 devil moustaches and 49 penises on newspapers in its lifetime."

Oi! - thats what i did!

:D

Oh yeah.

Peter

-- "The humble bic biro draws 13 beards, 9 devil moustaches and 49 penises on newspapers in its lifetime."

Umm, mines probly wrong because its what my french trip computer says, but at 80-85 i get about 37mpg, including the single carrigeway bits where i have to overtake and stuff (A64 for anyone what knows....). If i sit and cruise at 55, and keep my foot perfectly still, i get about 55-60mpg according to the trip computer :) But i never do that.

my dad's trip comp in his volvo gives you an average from daily driving and even total miles left in the tank hehe, he averages 44mpg in his 2.4 diesel S60 and it drops to about 40mpg when i use it a couple of times :)

The "range" indicator on the volvo trip computer is deadly accurate, I deliberately emptied my S40 once, and it started flashing "FUEL" just before it stopped moving!

My current one doesn't have the trip computer.

wish i could get 600-700miles to a tank :) the volvo must have a HUGE tank!

Currently 10:1 here, 8.5:1 on the new engine :)

If you stuck to 70 mph, Lucy (mark one Mondeo TD) would return at least 52 mpg. With a 60 litre tank, more like 65 litres if you used the expansion space, that gives you nearly 750 miles.

The 1.6 I had for a weekend managed just over 500 miles from just over 60 litres, 400 of these being motorway driving... that's just shy of 40 mpg...

We established that you drive like a girl ages ago, don't need any more evidence, thanks ;-)

Do you live (or travel in the evening) north of Leeds on the A1?

Heh! Maybe - but Charlie uses more petrol than I do for the same mileage but has a lower average speed....

Oh dear. Only you would notice a difference like that.