General Multijet MPG

[cassiuskitt]

I usually get between 58 and 70mpg 58 on a short run to work or town driving 70 on any long distance the cars not driven too hard always within the speed limit (when I'm driving anyway).
Its a 55 plate with 19000 on the clock but has only done 2000 over the past 12 months and still returns these figures.
Panda is running on the optional alloys with 165's on started with the standard steel's with 155's but was seriously sliding (cant believe they still sell it with those skinny tyres) interestingly when we changed to the alloy/165 combination the mpg went up 5mpg and has stayed there.

I would agree the engine is very refined and has a lot of go (really does like to be wound up nothing like my wifes punto jtd thats a fantastic long distance cruiser but runs out of go at 4500rpm but its far and away better than our old Focus Diesel ugh!!!).
The panda runs like a petrol for its driveability with the advantage of all that diesel torque suprises many people! and the turbo gives a most fantastic whistle thats much louder than the engine (try it in a tunnel with the windows down drop down one gear and floor it, its well worth it!if you havent done it already:devil

The Engine really is a gem and as long as I dont EVER take it to a Fiat dealer should be very reliable (crosses fingers). Basically car went in for service came out with faults went in to fix faults came out with MORE
took to a local under the arches type FANTASTIC:worship:
similar thing happened with our punto so have learnt my lesson.
ps the Panda was even under warranty at the time of the faults but did ****** all good. as long as its not taken to a Fiat dealer very reliable car and the engine is second to none.

 

[ScoobyChris]

But true Legal implication dictate that the speedo must read higher than it is

Thats why safety cameras will not capture you if you are doing say 33 mph as you pass one. Your true speed will be lower. I know about this stuff

Then you'll also know about the inherent inaccuracies of GPS and that the quoted chipset figures are for a much higher attenuation than is possible with most consumer GPS devices? This means that real-world GPS readings tend to be inconsistent and can be just as inaccurate as a speedo reading.

I know that car speedo's are not allowed to underread, but they are *allowed* to be up to 10% overreading so could actually only overread by 1% or be completely accurate. The speedo on my Mondeo (verified by a friend's speed gun ) was alarmingly accurate.

And the reason a speed camera would not trigger is because they are typically set to speed limit + 10% + 2mph which is the ACPO guidelines, so at 30mph you'd have to be doing a true 35mph.

Chris

 

[adi]

"And the reason a speed camera would not trigger is because they are typically set to speed limit + 10% + 2mph which is the ACPO guidelines, so at 30mph you'd have to be doing a true 35mph." Can't argue with that Chris.

 

[HP]

Some speedos are indeed accurate. An old BX 16v I had would hit the rev limiter in top at the max speed quoted in the handbook.

There seems to be a lot of panic on here about under reading speedos with different wheels/tyres - in reality unless you make a big change to the wheel diameter or tyre size the change will be negligible.

 

[Punto 1998]

My wife has Punto I have 306 estate 2.0hdi . My last car was m-reg 106 1.5 diesel always did 60+ MPG loved that car to bits to say it was the slowest car I've ever owned but that made it fun to drive.We had kids and needed bigger car that's why I got 306 estate I travel 9 miles to work about 130 miles a week, fill up once a month at shell and the mpg never drops below 49 mpg went to Cornwall and back on one tank full just over 600 miles 58mpg and that was driving at 70mph+ . now my youngest is 5 years old the push chair has gone in bin and im looking for a small diesel motor. with diesel at £1.20 per litre in Doncaster good mpg is important. I love driving my wife's punto and like the panda no cam belt chain that's £200 extra you save to spend on juice. But if the panda is only getting 55mpg is it worth me swapping yet?

 

[yknivag]

Then you'll also know about the inherent inaccuracies of GPS and that the quoted chipset figures are for a much higher attenuation than is possible with most consumer GPS devices? This means that real-world GPS readings tend to be inconsistent and can be just as inaccurate as a speedo reading.

:yeahthat:

and, of course, Sat Nav can be out in either direction. There is no legal constraint that they must err to one side like there is with a speedo and so they can under or over read.

The only way to determine accurate speed is with a radar gun or a time gate.

 

[HP]

Isn't there something about Sat Nav where you need to be at sea level on flat ground to get closest to accurate too?

 

[The Beard]

It will increase the rolling radius. Tyre profile is a percentage of the width. So your speedo will under-read and your gearing will become slightly longer.

I have too spent some time driving with the average mpg displaying, but quite often i just flip back to the total miles and drive it how i want to. I tend to find that i lose about 4mpg if i drive it hard. However a mixture of pottering along and full throttle acceleration means that its not too bad. Besides if its generally averaging 52-56mpg in varied driving i'm not sure i'm going to worry about that too much.

Thanks for the info. I couldn't remember whether an increased rolling radius gave higher or lower gearing.

Using http://www.miata.net/garage/tirecalc.html


you will actually be going 2% faster than you were before at the same indicated speed. In reality, I'll put a hill of money on it making your speedo closer to accurate - most speedos over read by at least 5% or so anyway.

Thanks for the link.