Club 80-90 Forums

keith wrote:35 MPG at a steady 56.....sounds about right ....anymore than that and your calculations are suspect somewhere

There seem to be an awful lot of us in here with cr*p maths skills then - coz I've just worked mine out for the weekend just gone and I get just over 38mpg for the run down to Exeter on the M5 at 60-65, pootling around for another 100 miles, and the trip back up at 60-65 again.

1.6TD with 1 nackered exhaust, 1 wife, 1 kid, me, and the usual cr*p in the back - fuel worked out by filling her up before we left, then filling her up again from the same pump when we got back.....

Yep about 34mpg for me, 1.6jx but a bit knackered.
Have I read that table right 30mpg from a 1.9wbx? mine never got any where near that. best I managed was about 25mpg once on an autoroute at 55mph for about two hours, both fully loaded campers with for people on board , other than that about 18/19mpg most of the time
My maths may be suspect on any of the above

i have tried all the diesels starting with the standard 1600 then 1700cc and the 1600 turbo and then i fitted a aaz what had slightly better performance but was still gutless and seriously underpowered this managed around 35 mpg but i just could not live with the lack of performance and struggling up every hill , if i ever went diesel again it would have to have tdi motor putting out around 150 bhp or more , in the end i swapped it for a loads bigger petrol engine now i get 28/30 mpg and hills dont worry me anymore and i dont have to change down every time i see a hill

I'm sure the amount of fuel you put in can be easily gauged but distance can sometimes be misjudged, inacurate speedo for example, GPS I'm sure would be better.

I have found 60mph comfy and I do about 7000 mile per year at an average of 37mpg. I have on a couple of occasions put my foot down ( yeah right!!) and gone at 70 but it doesn't like it up i much and i think the MPG definately comes down. For the extra 10mph its not really worth thrashing the van or using the extra fuel ,much happier at 55-60 .

keehotee wrote:

keith wrote:35 MPG at a steady 56.....sounds about right ....anymore than that and your calculations are suspect somewhere

There seem to be an awful lot of us in here with cr*p maths skills then - coz I've just worked mine out for the weekend just gone and I get just over 38mpg for the run down to Exeter on the M5 at 60-65, pootling around for another 100 miles, and the trip back up at 60-65 again.

1.6TD with 1 nackered exhaust, 1 wife, 1 kid, me, and the usual cr*p in the back - fuel worked out by filling her up before we left, then filling her up again from the same pump when we got back.....

hi...im not saying your adding up is bad. just that the inputs into your calculation may be suspect.

its very unusual for a manufacturer (vw) to publish fuel economy figures for a new van in perfect fettle.....and then to have those figures bettered 25 years later...considering wear and tear and all.

at 38mpg...you are very close to what the table says.
people claiming 50 + mpg....i think thats wishful thinking.

shepster wrote:I'm sure the amount of fuel you put in can be easily gauged but distance can sometimes be misjudged, inacurate speedo for example, GPS I'm sure would be better.

A GPS will only give you an accurate speed if you're travelling horizontally.....so although it'll give you your total miles travelled at the end of a trip - that would be horizontal miles travelled, ignoring any variation for hills. ie. travel down a 45 degree slope until your GPS shows you've moved 1 mile, but you (and your engine) have actually moved 1.4 miles. This is one of the main reason most parts of the world won't accept GPS tracklogs in court to prove you weren't speeding. Given how hilly bits of the M5 are, if my GPS showed I'd done 70mph from Bristol to Exeter, I'd have have to have gone at least 75mph to do it

Don't overestimate the effect of a slope on the distance travelled.

A 1 in 10 slope adds just 5 miles per thousand. A speed of 100mph would be out by just 0.5mph.

Must say some of the mpg figures are hard to swallow too. My 07 TDi Galaxy with 6 gears would struggle to get over 40mpg on a 60mph motorway run.

I suspect maths is not strong on 80-90!?!?

Pete.

Failure to burp the air from the fuel tank when refilling!!

That handbook extract's interesting...
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So - 2.1DJ vs 1.6TD JX...

Urban - 23.4 vs 32.5 - 40% better for JX
56mph - 32.1 vs 35.7 - 11% better for JX
75mph - 21.6 vs no figure - 100% better for DJ

But the German DIN figures... 1/2 payload, 3/4 max speed + 10% (of what, though?)
Tintop - 21.9 vs 31.0 - 40% better for JX
Hightop van - 20.8 vs 27.7 - 33% better for JX

So it looks like the JX wins hands-down when it's not doing so much, but as soon as you start to give it even a few berries it starts to wilt a bit, whilst the DJ copes far better with speed & load. Still thirstier, but the gap narrows hugely at even a constant 56mph. Wind that up a bit, and I'll bet it's a closer gap at 60-65mph.

Then, of course, there's the intangibles. We test-drove DJ & JX back-to-back. It was no contest. The DJ was just SO much nicer to drive. Quieter, smoother, much much quicker. And it wasn't just a duff single JX - we test drove three within a week or so, and the one we drove back-to-back with the DJ was the nicest of the three.

The %age maximum hill is also telling - 38% for DJ, 32% for JX. Sure, you're never going to really face those in real life - even the worst Alpine passes don't get too much beyond 10% - but it says a lot about how pleasant the climb's going to be. Especially if you meet a tractor, truck or something part way up.

I notice the poor old CS is so incredible that they did not dare put the figures in!

48.01 litres/4.54=10.575 gallons ------------------------441 miles/ 10.575 gallons=41.70mpg : D

mighty millsy wrote:48.01 litres/4.54=10.575 gallons ------------------------441 miles/ 10.575 gallons=41.70mpg : D

Now explain exactly how you calculated the fuel usage to two teaspoon-fulls.

no need , get further with my mpg.doing steady 55 mph no need to rush you miss the views

Still bulldung!