40mpg 190
 

mgzt :}top car

Moved to general forum

Sorry, as much as I love my 190, the only way to get 40 mpg out of it would be to turn the engine off at the top of a long hill! ;)

Or convert to lpg for the cash equivalent when compared to petrol

Hi David,

Agree it is a "top car". However, I really do wish I could get 40 mpg from my V6.

Another David :)

Lads think your 190s need to go in for a tune..

Are you reading the mpg off the computer?
If so you need to take that with a pinch of salt and do a brim to brim to work out your fuel economy :)

And I was happy last week for getting 38MPG from my 1.8t !!

Urban 20.2 mpg
Extra-urban 40.4 mpg
Combined 29.4 mpg

Sorry but that figure is impossible from a KV6. Fill the tank up at one pump, stop when the automatic filler shuts the pump off then when the tank is almost empty return to the same pump and follow the same proceedure. You can then calculate the true consumption rate.

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

http://continuouswave.com/whaler/ref...s/BSFCvRPM.jpg