Thread: fuel range

Originally Posted by rovercare

Has anyone actually calibrated their readings? I only say this, as my RR is spot on with 35" tyres and my 120" is still 10% out with 32", so that makes a big margin in your economy figures

Yep. In NZ we have the occasional 5km "odo calibration" setout on the road. Posts every km for 5 km.
Rangie seems dead on. But one of my jap cars was 10% under.

Originally Posted by rovercare

Has anyone actually calibrated their readings? I only say this, as my RR is spot on with 35" tyres and my 120" is still 10% out with 32", so that makes a big margin in your economy figures

My 110, with standard tyres, reads 7% high on both speed and distance, so you have to increase consumption by the same amount. This means my average of 10.5-11 l/100km is actually closer to 12.

John

Originally Posted by rovercare

Has anyone actually calibrated their readings? I only say this, as my RR is spot on with 35" tyres and my 120" is still 10% out with 32", so that makes a big margin in your economy figures

I find that mine, which is just running standard height tyres, gives a fairly accurate odometer reading (close enough over those 5km test on the highway), but when I checked the speedo against a GPS it read about 5km/h higher than the actual speed at any speed I was doing - so not really out by a pecentage. Not sure how this all calculates out then.
Previously posted that 120 on my speedo is actually 110km/hr in real life, well it's actually closer to 115 - but that seems to be the trucks 'sweet spot' so I just stick to it.
Either way, always been more than happy with the economy.

Originally Posted by rovercare

Has anyone actually calibrated their readings? I only say this, as my RR is spot on with 35" tyres and my 120" is still 10% out with 32", so that makes a big margin in your economy figures

Exactly. Both my IIA and my 110 read 100% accrately on 33.5" diameter tyres. So someone running 32's would get about 5% better economy than they should, and someone running 31's about 7.5% better.

My speedo is accurate with the gps, but over the 5 kilometre check it was out by about 3/10's. I seem to average 10 litres per 100 kilometres no matter how I drive it. Mine is fitted with the 4BE1 though, so not sure if this makes any difference or not

Originally Posted by JDNSW

My 110, with standard tyres, reads 7% high on both speed and distance, so you have to increase consumption by the same amount. This means my average of 10.5-11 l/100km is actually closer to 12.

John

Same here, my tyres are the same diameter as 750R16's (assuming this is standard), my speedo is 7% out both on speed and distance, when checked against the GPS. It's good when passing a radar or camera, not so good when working out long distance fuel and time.

Another dredging of an old topic
Over the last 1200km I've had an average of 11.8L/100km
Thats N/A, LT95 with 33" muddies, and my speedo under-reads by around 8% according to GPS so its actually a bit better than calculated. Driving has involved Sydney suburbia, two motorway trips ~350km's worth, and one evening 4wding with probably 30 minutes in low range after 2 hours in bumper/bumper 1st gear traffic.
Should be able to get better but not unhappy as is.

speedo is accurate with 35s, and a lt95 where the lt85 was. I get normally 12l per 100 and do 1900km between fills if i run empty.

Andy