MPG

rockdemon

rockdemon

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A quick recap :)

Re: My Rover

Postby ghce on Tue Oct 18, 2011 9:45 pm
P6 can achieve good MPG if you tune it up to be a bit lean, modify your driving style and you get very comparable results to smaller more modern cars, after all the p6 V8 weighs only 1300kg the same as a mid saloon. Ron from memory has had upto 30 mpg out of his demonstrating that it is quiet fuel efficient even as a 4.6 litre engined car.

Graeme
Re: My Rover

Postby SydneyRoverP6B on Wed Oct 19, 2011 5:43 am
Hi Brenten,

Graeme is on the money, and yes just over 30mpg for a 4.6 litre V8 running with carburettors is pretty darn good. I paid the same in Sydney for V Power on Friday, but on Monday BP Ultimate was 15cpl cheaper!

Ron.
4.6 litre Rover P6B

SydneyRoverP6B

Re: My Rover

Postby testrider on Wed Oct 19, 2011 8:37 am
Just for comparison Shell Vpower in the UK is about £1.40 per litre which I think is about $2.14AUS.

The trick is knowing when to go steady with the throttle to save fuel for later. :D
Paul


testrider


Re: My Rover

Postby billoddie on Wed Oct 19, 2011 9:59 am

SydneyRoverP6B wrote: just over 30mpg for a 4.6 litre V8 running with carburettors is pretty darn good



Darn right that's good!
My little Alfa 16v gets that...although it does get a pedaling.
All the same, that is a remarkable figure.
Are you just "tickling" the throttle though?
You know...so millimetre precise that you are virtually constant trailing throttle?
I once had an Alfa 164Q that cost me a kings ransom in fuel...I didnt hammer it, but liked to give it a little pedal now and then...in the end i just babied it and still couldn't get better than around 14 litres per 100km.

Whilst I certainly dont want to pedal the Rover, its fun to "squeeze" into the throttle of a V8 at times... (Im sure you know that...)

billoddie


Re: My Rover

Postby Dave3066 on Wed Oct 19, 2011 10:11 am

testrider wrote:The trick is knowing when to go steady with the throttle to save fuel for later. :D



By the time I get to the "time to go steady" stage it's usually too late and the next fuel station beckons.... :LOL:

Ron I bet you've had a few interesting comments and looks as you drive down the roads.

Dave


Re: My Rover

Postby Thijs Leuven on Wed Oct 19, 2011 10:23 am

billoddie wrote:last week, i paid $1.70 for Shell VPower...how on earth do you manage the fuel bill?



He're in the Netherlands we pay $2.15 (australian dollars) or more for the cheapest kind of petrol... :(
1977 Rover 2200TC

Thijs Leuven



Re: My Rover

Postby LeeEFi on Wed Oct 19, 2011 10:47 am

ghce wrote:p6 can achieve good MPG if you tune it up to be a bit lean, modify your driving style and you get very comparable results to smaller more modern cars, after all the p6 V8 weighs only 1300kg the same as a mid saloon. Ron from memory has had upto 30 mpg out of his demonstrating that it is quiet fuel efficient even as a 4.6 litre engined car.

Graeme



I managed to achieve 26mpg with my SU carbed 3.9 litre automatic recently. Not that bad I thought, as the journey (130-miles) involved quite a bit of 70mph criusing. I think I'll try a pair or free-flow (K&N) filters at some stage soon, as I'm still using the factory type at mo. They should improve mpg a bit :?:
Lee Smart
1985 Rover VandenPlas EFi
 
Lee, Worth checking out Chris York's thread 'lucky breathes easy' for free flow air filters.

I've got needles and filters ready to go onto pae - just need a spare air filter housing to butcher first.

I've just got a zf4-hp22 gearbox from a bmw 528 (still need the range rover version!)

I want to swap to an electric fan system at some point. (It currently has a kenlowe fan but the install is dodgy so i dont trust it enough yet!)

Hopefully that will get me up to 30+ mpg on the 3.5 auto!

Rich
 
Got 27.5 MPG out of mine when it was still on SU on a very long trip of about 1500 miles most of which was 65 to 75 MPH, auto BW65, want an electric fan in mine but havent got to it yet. Have been meaning to do a measured run with the weber 500 carbs but havent yet, trying to think of an economical and accurate method to do so, was considering a seperate 2 gallon tank so I could get an exact figure rather than having to fill the tank (and empty my wallet) without having to run around endlessly and only get an averaged figure.

Graeme
 
My experience is that by far the greatest influence on MPG is driving style, google around for extreme economy driving for tips.
 
My experience is that by far the greatest influence on MPG is driving style, google around for extreme economy driving for tips.
Click to expand...

Very true. I guess my little projects/aims are to increase the limits of mpg, but driving like a hooligan i'm sure 8mpg will still be possible. In general i'm getting 15mpg around town and about 25mpg on a run.

Rich
 
webmaster said:
My experience is that by far the greatest influence on MPG is driving style, google around for extreme economy driving for tips.
Click to expand...

Very, very true. I know it's not got a V8, but my TC is capable of maintaining a consistent road speed with only very small throttle openings. Despite it's rattly bottom end and lower-than desirable compression, I can still nudge 37/38 mpg out of the old girl at 55mph in the inside lane.
 
rockdemon said:
I've got needles and filters ready to go onto pae -

Rich
Click to expand...

Can I ask which needles you've gone for? My filters need changing, and there's some freeflow ones like Chris has used on Lucky around that're almost as cheap as the paper ones.

I'm getting 27mpg on a long run and about 16 round town, got a Kenlowe on but it seems to never need it, it'll only heat up enough to make me put it on if I'm in a traffic jam for over half an hour.
 
If economy is the goal you could fit a vacum guage to keep your foot off the throttle.

tim_vac-gauge.jpg
 
I'm getting 27mpg on a long run and about 16 round town, got a Kenlowe on but it seems to never need it,
Click to expand...
If you're brave and trust your kenlowe installation, then removing the engine driven fan *should* give an increase in mpg/more power depending on how you drive it.

At speed the air coming through the vent will do the cooling. There have been a few discussions on this but at idle speed the engine driven fan is pretty useless as the engine is turning very slowly so the kenlowe is probably better at this job. At 5000rpm you're turning the engine fan round and shifting that much air when it's really not needed!

Rich
 
rockdemon said:
My experience is that by far the greatest influence on MPG is driving style, google around for extreme economy driving for tips.
Click to expand...

Very true. I guess my little projects/aims are to increase the limits of mpg, but driving like a hooligan i'm sure 8mpg will still be possible. In general i'm getting 15mpg around town and about 25mpg on a run.

Rich
Click to expand...

Hi,

I can certainly confirm, from personal experance, that single figure (average) MPG can be achieved even with a completely standard engine and even on events that feature relatively long road sections :oops: What the actual peak useage is when driving at maximum attack :twisted: I'd really hate to think.

Tim
 
rockdemon said:
If you're brave and trust your kenlowe installation
Click to expand...

Yes to the first and not really to the second, although it has a manual override switch. As soon as I noticed it had a kenlowe and that it wasn't being silly I took the lawnmower bladed fan off. Still seems to be OK, especially after heater rebuild, and putting the thermostat in the right way round (thanks PO...)
 
webmaster said:
My experience is that by far the greatest influence on MPG is driving style, google around for extreme economy driving for tips.
Click to expand...

My Three Thousand Five, Ol' Rumbly, is particularily frugal on the fuel, and is in every way more economical than my 2200 auto was. The car is not down on performance either, she will really move if provoked.

Heather and I did a few days away around the Nuffield Bash, which led to a tour of the Cotswolds in August. I did 297 miles overall on just under ten gallons. 30mpg, for arguements sake.

Couldn't wish for more, even in mixed urban driving, with a lot of stop/starting she'll do circa 23mpg.
 
rockdemon said:
I'm getting 27mpg on a long run and about 16 round town, got a Kenlowe on but it seems to never need it,
Click to expand...
If you're brave and trust your kenlowe installation, then removing the engine driven fan *should* give an increase in mpg/more power depending on how you drive it.
Click to expand...

I ran my 2200 Auto for a year with no engine fan, just the Kenlowe. I wouldn't advise it in hot weather, but I do suspect it got me an additional 2-3mpg.
 
What Nick said above. My V8 will run stationary for a not too long a period (10 mins - 1/4 hour) in moderately warm weather before the needle starts creeping upwards and Mr Kenlowe makes an announcement.

My V8 benefits from a flushed out block, jiggle pin thermostat and a 3 row reconditioned rad, but with just 600 rpm from the engine driven fan this is not going to keep a sufficient flow of air across the rad to keep the engine temperature down.
 
I ran my 2.2TC for years with no engine fan and a DIY electric fan (citroen BX in front of rad), had no problems.
 
Works wonders disconnecting that temp gauge, eh Richard? :wink:

When I purchased my V8 some 17 years ago, the owner had 'cleverly' tampered with the gauge and pressed the needle against the face of the dial in the white-green transition to give the impression all was well with the temperature (when it really ran too high). What a knob!
 
rp61973 said:
When I purchased my V8 some 17 years ago, the owner had 'cleverly' tampered with the gauge and pressed the needle against the face of the dial in the white-green transition to give the impression all was well with the temperature (when it really ran too high). What a knob!
Click to expand...

You don't know that for certain, (do you?) the previous owner may have taken it into a garage to get the overheating sorted, and they charged him for doing a pair of head gaskets, when in fact all they actually did was bend the needle on the temp guage......
 
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