My RTL has about 4500 miles on it, and I've noticed the auto correction on the miles to empty as I ride. But yesterday it was acting very strange. I left the house with 121 miles to empty, rode 30 miles, and when I got back to the house, I had 160 miles to empty. I can't imagine my route/speed could make that much difference.
My 2013 RTL doesn't have too much of that BS stuff that gets calculated by the computers and shown on the dash/display, and if I want to know anything like that, I can use my brain and get a much more reliable/consistently closer to correct answer (often without even consciously thinking about it!
) But the Child Bride's car has all sorts of bunf like that, and it's fairly easy to see how 'the computers' can get it so wrong so often!!
Like all vehicles with this sort of display, her car works out the 'Miles to Empty' based upon its most recent driving, ie, the stuff it's just done, because the computers cannot predict what you are gonna be doing/how you're gonna be driving/the terrain you're gonna be facing in the next 20-30 miles or so - not at all, so everything shown on that dash is all retroactive! Consider - we live near what used to be country town that's now getting swallowed by suburbia, and we're near a major Interstate Freeway that climbs up into the Hills from Adelaide, then heads down from the crest, goes on East past us, and heads on down onto the plains of the Murray River Valley before crossing the River and heading off toward the Eastern States. So if the Child Bride heads out of our place, turns onto the Freeway, and then chucks a LEFT, heading West on the Freeway, she's got about 15 miles of largely uphill driving before cresting the spine of the Hills alongside Mount Lofty, our tallest local peak, and then dropping down onto the Adelaide Plains; but if she instead turns RIGHT and heads East, she's on about a 30 mile mainly gently downhill run until she reaches and crosses the River at Murray Bridge. So when she comes home on the Freeway after her day out, if she turned left that morning, she's either been pretty much coasting downhill for the last 15 miles, or if she turned right that morning, she's been climbing uphill for the last 30 miles...
And guess what?! No matter how full the tank is, if she's been coasting downhill for the last 15 miles, her car's 'Miles to Empty' display shows a fairly healthy number (one that is
invariably wildly incorrect); but if she's been climbing uphill pretty much all the way for the last 30 miles or so, even if she filled the tank to almost overflowing before leaving the Bridge so that it's barely dropped at all by the time she gets home, the 'Miles to Empty' display shows some piddly little number (one that is
invariably wildly incorrect)!! The 'Miles to Empty' display has clearly been calculated on how hard the engine was working in that last lot of driving she did before she got home - if she's been basically coasting the car on the downhill run, the range shown is very clearly biased by that 15 miles of coasting and barely using any gas to keep the car at Freeway speeds; but if she's been working it harder on the loooong steady climb up outta the River Valley, sucking gas like happy juice the whole time, the 'Miles to Empty' display shows far less!!
And funnily enough, if she parks it one night with whatever displayed on the 'Miles to Empty', then the next morning she heads out and turns onto the Freeway as if she's planning on re-tracing the same drive she came home on last night - saaay, she came home from the City yesterday, so she coasted downhill for 15 odd miles before arriving home, causing a great looking 'Miles to Empty' distance to show, but today she heads back toward the City, effectively reversing that 15 mile downhill run and climbing back up to the top of the Hills, her car's 'Miles to Empty' distance will plummet in the first few miles of driving!! Yet if she goes the other way, heading on down into the River Valley, it'll climb; and vice versa! Still, we know that whatever it displays after she's done one of those 'drive to the City & back' days or 'head out to the Bridge & back' days, the 'Miles to Empty' display will invariably be wildly inaccurate immediately afterwards and will take some distance of 'normal' driving to return to showing anything useful, if you can ever call it that!
This is just what it is, simply because the computers can only look backwards and show you a distance based upon your recent past driving; and for my 2 bob's worth, my brain does a far better job of 'calculating' that particular 'guesstimation',
if I even need to think about it, invariably arriving at a figure that's a lot closer to reality than the computer's calculation ever does, simply because I know what I was driving like
in the driving I've just done, only unlike the computer,
I can also 'foresee' to a far greater extent than the computers can (ie. 'somewhat' rather than 'not at all!')
how I'm likely going to be driving in whatever driving conditions and terrain I'll be facing next! 
Not that I ever worry about the 'Miles to Empty' when I'm on my Spyder too much anyway - I
KNOW thru experience that I have a certain 'likely range' for whatever type of terrain &/or riding I'm doing, and I watch for that limit to get closer on the Trip meter that I reset when I last filled up, aiming to refuel before reaching that (altho I do tend to purposefully err on the conservative side). It's been years (no... correction - it's been
decades! ) since that particular technique & my experience has failed me on that count!
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My cars also adjust the DTE as I drive too, if I get on the highway I've seen it go up.
