Still waiting for my frontier tank to arrive. Not overly concerned about trip computer any more. Did some serious 4WDing today with some steep climbs and descents. Played merry hell with the trip computer and the fuel gauge. Around 1/4 of an hour or so going down hill and the gauge went from around 1/2 full down to 1/4 full and stayed there for ages, then when I was going up the other side, the litres per 100 Kms average went from 14.5 to over 17, as you would expect. Trip computer then told me I had 129 Km to empty (with half a tank). Then I had a long mostly downhill drive out of the high country and 90 of Kms later, I still had 129 Kms to empty. I must admit, I hadn't paid much attention before I started looking at long range tanks, but it seems like the trip computer is fine on hwy or relatively flat roads, but chucks a wobbly in the steep stuff.
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Ranger PX dual cab
Honda VTR 1000
Well, new tank is installed, I've done a bit over 300 km on what the gauge says is 1/4 of a tank, which works in with my estimate of around 1,200 Km from a tank. I'm currently averaging 11.8 l/100 Kms according to display, although I reckon I'm getting a bit better than that due to the larger tyres. Fuel computer still useless though, distance to empty, 450 km on remaining 3/4, I hope not. Refilled just after this, put in 48 litres and DTE went back to 650. Oh well hopefully after a couple of trips I will get a handle on how the gauge relates to what is left.