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Puzzled re this Speed. Do they add an additive for winter there..? I wouldn't have thought petroleum would freeze, but hey, what do I know..? I know in Canada you often need specially thinned oil. We don't get anywhere near cold enough to risk that here in Aus anyway.
 

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Yes Peter. Our fuel changes from Summer to Winter. Probably more often than that even.

Speed, Maybe I haven't been hit by it yet but my fuel economy hasn't changed yet. My dash still reports 8.0 to 8.3, whereas my actual has been pretty consistent at 9.0. You've seen the thread I posted. Maybe time to try driving in SMART. I'd still like to see what your actual is next time you fuel up.
 

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Frankly, I drive in Eco virtually all the time, unless in a hill section. It seems to accelerate at about the rate you would normally, (unless you're really in a tearing hurry), when catching up after a gap opens when on cruise, and it's so easy just to slip it into S manual or kick it down even, if you really want a hurry-up. It does definitely help with the economy, as the name implies. I've noticed several motoring journos here in Aus, when reviewing the Seltos, made the comment that the Eco setting was not only eco, but also quite drivable, and not horribly sluggish, like the eco setting on many other makes, and therefore just not used. But I'm doing an economy check, as discussed elsewhere, to see how accurate the car's computer readings are, also.
 

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Discussion Starter · #5 ·
@peter47 - yes, winter gas with anti-freeze additives are a thing up here. -40C can turn gasoline to gel and freeze any wayward moisture in the fuel system. Unfortunately those additives do inhibit combustion somewhat and that (combined with more and longer idle times) usually impacts fuel economy in the winter.
My 2019 Jeep Cherokee would struggle to even hit 14L/100 in the winter and was usually around the 16L mark. Summer would be around 11 to 12.

@SHCS - I actually have been in Smart mode since the ice and snow hit and not putting the lever over to the "S". The sportier shifting and ice on the takeoff are fairly incompatible...lol. The Smart mode with "D" gives it a nice easy takeoff and softer shifting for slippy conditions. Economy is still hovering pretty much around the 10L mark, but we probably got the winter formulation a little sooner here in Saskatchewan...weather can get pretty shitty, pretty quick.

@peter47 - I tried out a speedometer app the other day and it was a bit laggy, also had my Waze maps up on the dash (which gives speed readout). Waze matched the app and from the looks of it, my speedo is reading about 1 KM/H low at around 90 KM/H, I also noticed it would fluctuate on the app readouts between 66 and 67 when I had the cruise set at 66. This would indicate I am reading slightly low with the oversize (which is what it should do), that also means that I can assume my speedo was very close to exact on regular size tires.
 

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Ah...no, Speed. According to my calculations, backed up by several web sites, the opposite is the case. Larger tyre overall diameter means when you are now doing say 60mph on the dial, the wheels are actually covering a greater distance, (the indicated speed relating to revolutions per minute, and always corresponds to the speedo reading ), so you are going faster than indicated. In your case it has corrected the factory under-read to almost spot on. If you had got the 245/50/R18 tyres, it would be spot-on, or you might be actually going a tad faster than indicated.
 

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Discussion Starter · #7 ·
Ah...no, Speed. According to my calculations, backed up by several web sites, the opposite is the case. Larger tyre overall diameter means when you are now doing say 60mph on the dial, the wheels are actually covering a greater distance, (the indicated speed relating to revolutions per minute, and always corresponds to the speedo reading ), so you are going faster than indicated. In your case it has corrected the factory under-read to almost spot on. If you had got the 245/50/R18 tyres, it would be spot-on, or you might be actually going a tad faster than indicated.
ummm...That's what I said...speedometer reads lower than actual speed with larger tires...lol
 

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Ok, maybe we are at cross purposes here. Let me use an example. At a speedo read of 100kph, by several GPS based checks, and also by those roadside radar speed checks, I am actually only doing 96kph. Kia, and many other car makers, now deliberately build in a several kph over-read on the speedo, because in many countries no under-read is allowed, so they bend over backwards to avoid that. If I was to put on a set of tyres that raised the diameter slightly, then, because at a speedo read of 100kph, the rpms being detected are the same, by definition, then the greated diameter will mean the car actually covers a slightly greater distance than before for the same rpms, so will be traveling a bit faster. In the case of my car, that would bring the actual speed a bit closer to the 100kph I had it set on. Are we agreed on that..?

If we are, that means you slightly larger diameter tyres have brought your speed to closer to correct, but your comment that the originals would be spot on, is the bit that is not, as it were, spot on. You were actually going a bit slower on those. Probably more like the 4kph slower, (ie 96 @ 100 on the dial), like mine is now.
 

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Why this is worth clarifying, is that when I get round to new tyres, as well as trying a different brand, like the Bridgestones or Pirellis, or even Falkens I am more familiar with, and therefore might be quieter..? As the radar cruise does allow one to set a speed and hold it accurately, and I would like that speed to actually be accurate, not 4kph short, and maybe annoy others coming behind, it could be good to go up a tyre width, and even tyre wall % of that to say 245/50R18s, bearing in mind that means the sidewall is 50% of the tyre width, so would give a slightly higher diameter than even your 245/45s. That might make the speed accurate and match the speedo, and radar cruise set speeds exactly..? Strange how the whole world has settled on metrics for the tyre width and sidewall, but sticks to inches for the actual wheel diameter isn't it..? Weird really. But that's the way it is everywhere as far as I know. 😊
 

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Discussion Starter · #12 ·
I'm researching 245/50R18s even as we speak/type... 🙏
Might want to check and make sure there are no warranty issues with going that large...you're pushing almost 4%...most manufacturers recommend a max oversize of under 3%.

EDIT: you said 245/50R18...which is actually more like 5%...you may have issues, check your clearances before you commit.

PS...Don't tell the truck guys...lol...I see so much of this kind of stupid shit around here in Saskatoon.
I tell the wife it's like mountain climbing in high heels...pretty hard to air down a low profile mud tire...lol
and you know that none of these prissy beasts will ever see any mud or the like.
 

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You are right. It will need careful appraisal, and in the end, the 245/45R18s might be the safest bet.
What my research has already brought to light however, is that the ex-factory Kumhos don't rate very well at all, at all...well with the prestigious Aussie mag called Wheels, anyway...hmmm...
Although they tested here the Kumho Crugen Premium, whereas those fitted to mine are Kumho ECSTAs, whatever that difference means..?
 
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