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simesman wrote:Thanks Andy. I'm pretty sure my mate must be lying. 40mpg does sound a little unlikely and I'm pretty sure he wouldn't have a clue how to work out precise mpg!
I still reckon that most of you are getting better than 24mpg when driving especially carefully. I used to run an old V8 and believe me, I know how to get the most out of a gallon!
Just to answer a few of your ideas, I don't have a roofrack, the tyres are road biased 205's (Goodyear Wranglers), oil + filters changed regularly, air filter new, did the sedimenter recently, did try some Commer injector cleaner when I first got it, but didn't make any difference. The smoking is weird. I would say it only puffs out bad smoke about 50% of the times that I observe it and then, predominantly on the over-run. The motor has done 149K and injectors all replaced 5000 miles ago.
Interestingly, I suspected the turbo might not be doing its stuff properly, so today I rigged up a boost gauge so that I could see what it did. All seems to be by the book, boosting to about 1 bar at between 2-3000rpm and with full boost loading it up hill at around 1500rpm. So I assume the turbo and wastegate are functioning correctly.
I have also just adjusted the smoke screw in 1.5 turns and turned the diaphragm 60 degrees CW, as my reasoning is that I may as well benefit from a potentail performance increase if the fuel consumption stays the same. I definately feel that the engine is having more fuel dumped through it than is used, so what could it be?
thebiglad wrote:I think it is very unlikely to be the injection pump.
Is your viscous fan on all the time?
All ours have their fans taken off as soon as we get them, not a huge difference but a cumulative benefit.
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