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Old 8th July 2012, 20:08   #1
david riley
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Default 40mpg 190

mgzt top car
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Old 8th July 2012, 20:09   #2
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Moved to general forum
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Old 8th July 2012, 20:22   #3
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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!
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Old 8th July 2012, 20:34   #4
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Or convert to lpg for the cash equivalent when compared to petrol
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Old 8th July 2012, 20:38   #5
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Quote:
Originally Posted by david riley View Post
mgzt top car
Hi David,

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

Another David
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Old 8th July 2012, 20:39   #6
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Lads think your 190s need to go in for a tune..
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Old 8th July 2012, 20:43   #7
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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
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Old 8th July 2012, 20:46   #8
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And I was happy last week for getting 38MPG from my 1.8t !!
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Old 8th July 2012, 21:05   #9
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Urban 20.2 mpg
Extra-urban 40.4 mpg
Combined 29.4 mpg
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Old 8th July 2012, 21:07   #10
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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


Last edited by rover54; 8th July 2012 at 21:14..
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