Thread: Bulls bars

Originally Posted by Discotd5fan

RC42 you and I seem to be getting similar fuel consumption. At the moment around Brisbane mine is using about 20/21ltrs per 100km. I have just put one bottle of injector cleaner through it. Did you run a few tanks of 95 or 98 octane?

Cheers

I've just finished the second tank of premium, 98 octane I think but its the most expensive stuff in the garages, each tank had a full bottle of injector cleaner so about twice the typical dose rate. We then went on a long trip to Fraser so over 3 hours on the highway each way and the engine seems much happier. I'll probably stick with the high octane fuel, it seemed to improve consumption as soon as I filled up.

I also gave the MAF a good spraying with MAF cleaner about a week ago but that didn't seem to make much difference at the time.

I'm also running 265/75R16 tyres which are about 9% larger than the original ones so actual economy may be around 15/100km but I haven't checked it on the GPS. The speedo was reporting about 7% high with original tyres but it now reading about 2% low, all factory speedos seem to report a higher speed than GPS though so that may be allowed for in the trip computer's fuel consumption calculations.

Whatever the true consumption I'm glad I don't use it as a daily driver, my BMW diesel can do about 7/100km so I'll do the daily commute in that.

Ditto with the daily drive not being the p38. I have a Nissan X-Trail as a company car. Even better when someone else pick up the fuel tab .

Gary

Same here. The P38 is just the weekend toy and camping car. Our other vehicle is a very boring, yet fuel efficient Camry. I feel my cars are at two totally opposite ends of the scales haha

Ditto for me too, but not for fuel consumption reasons! Our Dmax is a car that gets serviced by the mechanic, gets driven by wifey, and thus the Rangie spends all its time camping and 4wding when not parked in the garage. Plus I'm not a fan of short trips on two engines, would rather have one motor carbon up than two.

Originally Posted by mtb_gary

Are you basing your figures on the dash readout or GPS distance? Don't forget running with your bigger tyres means you are actually travelling further than what is indicated on the dashboard - maybe around 9% giving actual usage of around 19l/100k

Gary

Fair point Gary. Yeh my 265/75/16 km2's at 100km/h show 90km/h on the speedo. And I think in standard form at 100km/h it used to show 102km/h. So I've always assumed about 12% error in fuel usage assuming it was right with standard tyres. Never bothered measuring the odometer and fuel usage accuracy though.

My figures are based on what the car tells me. My tyres are 255/70r16 so bigger than standard When speedo says 100 gps says 97.

I also seem to get a vibration at above 95km/h I think I may have a slightly buckled wheel from my last off road adventure.

The car is my daily drive not that I drive much during the week ad I cycle or take transport leaving the p38 for off road and camping trips. That said with the recent rain it has been used a bit more often.

MAF cleaning has helped a fraction now down to 22L/100 on a 1 hour freeway drive. Still higher than the 14L/100 that I used to get.

Maybe bearing are going?

Originally Posted by rc42

I was getting about 21/100km around town but a couple of tanks of premium fuel with extra injector cleaner added has brought it down to 17 which seems OK for a 2000 4.6 with 160,000km on the clock.

Must agree. I had a BMW 328i a few years ago. When I ran it on premium fuel, I drove it about 4 inches off the ground!
I know they have ignition timing adjusters for crappy fuel but it ran better on the dearer fuel and had better fuel economy.

Originally Posted by intheozone

My figures are based on what the car tells me. My tyres are 255/70r16 so bigger than standard When speedo says 100 gps says 97.

I also seem to get a vibration at above 95km/h I think I may have a slightly buckled wheel from my last off road adventure.

The car is my daily drive not that I drive much during the week ad I cycle or take transport leaving the p38 for off road and camping trips. That said with the recent rain it has been used a bit more often.

MAF cleaning has helped a fraction now down to 22L/100 on a 1 hour freeway drive. Still higher than the 14L/100 that I used to get.

Maybe bearing are going?

When you were getting the 14/100 was that on road tyres? I get a large variation between tyre types, when I am on my road tyres I am getting around the 14/100k, but as soon as the muddies go on 20+ (GPS based) highway driving. I have put it down to tyre construction plus the larger diameter means the car is less spritely up the hills when running on the muddies. Interestingly when running the road tyres and towing a 2t boat I average around 18/100 on the highway, but I do drop the speed back to around 100 rather than the 110.
Gary