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Discussion Starter #1
:wow: Who'd of thought it.

Around town I average 15-18 MPG. However on a 300 Mile run that involved at least an hour sat in traffic not going anywhere and at least an hour at 80-100 MPH (on a private runway) I averaged over 25 MPG.

I knew town driving would be heavier on fuel and that as soon as I had a chance of streching the cars legs my MPG would improve but I never thought it would improve by this amount. It wasn't like I was driving in a way to conserve fuel.

What are your experiences?
 

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Exactly the same as to be expected.

Stopping and starting will always burn more fuel on average than a steady run.
 

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My GTA is excactly the same, hates the traffic. I did almost 100miles on a quarter of a tank the other day. Then in town i got stuck on a cursed shopping trip for 45 mins in traffic and it used the same in about 6 miles!
 

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Discussion Starter #6
Exactly the same as to be expected.

Stopping and starting will always burn more fuel on average than a steady run.

Agreed but a good hour of my (cough) runway jaunt was sat in traffic and yet I still saw this huge improvement.
 
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I seem to remember reading somewhere that you get the most mpg (on a TS anyway) at 4000rpm in 5th which is about 95-100mph or somewhere therabouts.

Anyone else read that anywhere?
 

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my V6 averages around 22mpg but on a eco run the other week back from south wales i got 36mpg.
 

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Mu 156TS would do around 33mpg at motorway speeds. My Fiat does around 36mpg at the same speeds as long as you are easy on the right foot.
 

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I got 28.5 mpg out of my V6 on a long journey in France. Three hours at 90-100. For reference, 90 is at 3.5k rpm in 6th. I averaged 410 miles per tank. I thought that was pretty impressive until I saw someone'd done 36mpg.

It's also interesting that your air resistance increases with the cube of your speed - so it takes 25% more fuel to drive at 75 than at 65. Given that, it's surprising how economical the V6 is at high speeds :)
 
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Yep I can confirm this on my car it's around 80-85Mph @ 4000rpm, at 3000rpm it's just under 70mph.
Whatever, not too far off. Might have been 4700rpm I was remembering actually but still, seeing as I can't for the life of me remember where I read this I can't justify it so never mind.
 

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Aye 4700rpm sounds about right for 90mph. Unless of course you have changed your 5th gear! :D
 

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Just been on with this MPG testing in mine. I'm getting 25mpg on a motorway run and 15ish round town....not bothered, petrol prices are down and the V6 sounds so good.
 

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I've covered just over 3500 miles of mixed motorway / a & b roads in the last month in my phase 1 1997 TS spider. I'm averaging 33mpg and around 360 - 380 miles per tank.

The car has covered a about 80k miles and is in good condition and tune and isn't driven with economy in mind.

A bit better than my 2.5ltr Impreza which struggles to give more than 25mpg over the same journeys
 

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my 2 litre gtv 1996 limited edition (full body kit) does over 36-38 mpg on long runs and i dont hold back but stop start to work OUCH
 
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