How to get 49.5 mpg
 

I've just done a 320 mile motorway run having installed the egr bypass, BMW replacement PCV AND Mr Muscle oven cleaned the manifold to achieve (IPK) 49.5mpg, 4 mpg better than I've ever obtained in 6 year's ownership. And some of the distance covered was legal speedwise.

Can I just put a slight dampener on it, the IPK fuel reading is always optimistic. Only reliable way to get a fuel consumption figure is doing a brim to brim mileage calculation.

Too true.
I only use my 2.5 V6 Auto for longer journeys, rarely "around town" and IPK currently shows 39.2mpg :eek: since I last reset it 700 miles ago.
Now where's that pinch of salt...!?
It's a low mileage hobby car so mpg not a major concern and I use BP Ultimate.
Never raced or rallied that's for sure! :D
Regards
John

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Steve can I disagree?

A very good and accurate alternative is to add up the gallons of fuel bought in a 12 month and divide it into the mileage driven.

I wouldn't have the patience to wait 12 months to find out average fuel consumption.

Steve


You don't have to wait necessarily. I keep a record of fuel purchased, I can then refer back anytime to see my current mpg.

Dunno if I'm missing something but I cant see any difference between what you do and a brim to brim calculation, just the way you are doing it gives an ongoing average . . . . with a 260 I don't think I'd want to know the ongoing average.

I manage on average 48mpg on my diesel, with a clean inlet manifold, EGR disabled, that's with mainly 60mph - ish running.
That's calculated by brimming the tank and mileage recorded and working it out rather than what it says on the IPK, but, I will say normally my IPK is only on average 1 mpg out which I was quite impressed with!

The only thing I know about tyres is I had some decent part worns on last year and my mileage dropped to 44mpg. Replaced them early this year and back up to 48mpg. Of course, that's just on the computer but still - tyres obviously make a massive difference!