40mpg 190 - Page 4

Bolin · 10th July 2012, 00:16

Hmmm I once got 44.1mpg on a long trip (~230ish miles) on the computer, wish I had done a brim-to-brim for that one.

Going at 50mph through the motorway roadworks (esp. those darned ones on the M1 in Buckinghamshire!) seems to make quite an improvement to the computer's mpg reading.

p2roverman · 21st October 2018, 22:18

Quote:

Originally Posted by rover54

Minimum consumption occurs with steady motoring, in top gear and at a point called the minimum specific fuel consumption. For a typical petrol engine this occurs between and 1/3 and a 1/2 of maximum engine speed. A power curve looks like the profile of a mountain, whereas specific fuel consumption looks like the valley between two mountains. The point at the bottom is the minimum specific fuel consumption and that is the point whereby minimum fuel consumption occurs when compared to power produced. This is a dyno figure, on the road many other factors combine to increase fuel consumption, air resistance, how slipperey the car is through the air for a given speed, rolling resistance (tyres, hub bearings), the weight of the car, drag that tends to pull on the rear of the car as it is pushed through the air, air pressure. Taking all these things into account I have found the best ecconomy from my 2.5 is achieved at around 2,500 revs in top gear.

This illustrates what a specific fuel consumtion curve looks like

Pleased you posted this graph which gives the reason why I seemed to be getting better consumption at a higher speed, 42mpg at average speed of 72mph over 80 miles of manily mway driving, a figure disputed when I posted this last week (search KV6 petrol consumption, I think)

almost repeated it today from Scotch Corner to Leeds outskirts driving at 70 (50 in roadworks) getting 42.8mpg. I didn't record the average speed, but certainly less than 70.

championdaddy · 22nd October 2018, 10:09

Good grief........... how many more 190 mpg posts are there going to be ?

If you have a 190............ who gives 2 hoots about the MPG !?!?!?!

I have a 190 Ztt which will soon be for sale..... why ? MPG ??? NO.

I want a saloon LOL

Oh yes..... the Audi is for sale too............doesn't make me smile.

10th July 2012, 00:16	#31
Bolin This is my second home Rover 75 2.5 V6 Connoisseur SE 4dr manual Wedgewood Blue 2 04-05/06/2001 Join Date: Nov 2006 Location: N.E. Hampshire Posts: 4,617 Thanks: 289 Thanked 308 Times in 243 Posts	Hmmm I once got 44.1mpg on a long trip (~230ish miles) on the computer, wish I had done a brim-to-brim for that one. Going at 50mph through the motorway roadworks (esp. those darned ones on the M1 in Buckinghamshire!) seems to make quite an improvement to the computer's mpg reading.

22nd October 2018, 10:09	#33
championdaddy This is my second home Mg Zt 190 Join Date: Apr 2012 Location: The FIRST Garden City....Letchworth. Posts: 6,778 Thanks: 1,243 Thanked 920 Times in 698 Posts	Good grief........... how many more 190 mpg posts are there going to be ? If you have a 190............ who gives 2 hoots about the MPG !?!?!?! I have a 190 Ztt which will soon be for sale..... why ? MPG ??? NO. I want a saloon LOL Oh yes..... the Audi is for sale too............doesn't make me smile.