Yeah, 80% is not correct. The steepest grade in the Tour de France is 24%, and only the most elite riders can climb that. The average unassisted rider probably can’t handle more than 10%. Above 60%, you probably need a rope to climb on foot.
@RivkahChaya, if you map the bike route now, how far does Google say it is for the 1hr 27min estimate?
80% is already very steep, steep enough that it’d be stairs rather than a road, but @RivkahChaya didn’t even say that; she said 80 degrees.
I did say that, because it goddam looks like that-- it honestly looks like it goes straight up. But I have not measured it with a protractor, or anything. It probably is 45 degrees, and is an optical illusion, because you come at it, and can’t see anything else. And like I said, it changes grade. It’s probably that sharp grade for just a few meters.
And I just did a headslap. 
I’ll bet the bike-to-bus time is interfering with the calculations. Which just goes to show how stupid computers can be.
The city buses have bike racks, so you can bike to a bus stop, ride the bus a few miles, then get off, and bike to your specific destination. You could end up with an average speed of 33mph.
I’ll bet those are point-to-point getting averaged in with straight-up bike trips.
Not to mention, I just now realized that even though Mo-peds are legally motorcycles (I think they need a license plate, but electric bikes don’t), because they run on gas, and they are not supposed to be on the trails, people ride them there anyway, I secretly suspect because they can weave in and out of the bike and pedestrian traffic the way real motorcycles weave in and out of cars. Mo-peds aren’t even allowed on the highways. Anyway, they may get averaged in with the bicycles too. But they are doing 25mph at least, and that’s on the trails, with posted 15mph limits.
As a little experiment, and maybe adding one data point to the discussion, I asked Google Maps for directions from home to work (11 km from suburbs to city, on a mix of suburban and main roads and city streets, with maybe 30 traffic lights on the route). The journey is substantially downhill on the way to the city and uphill on the way back. It takes me roughly 35-40 minutes to cycle to work and 50 minutes to cycle home.
Google estimates 38 minutes for the journey to work and 48 minutes for the journey home, which is very much in line with my actual experience.
This also tells me that Google either takes the gradient into account when calculating the travel time, or uses measured travel times.
Looks can be deceiving for slopes. If it really was 80 degrees, your bike would lose traction well before it reached that angle and you’d fall backwards.
I once went up a 22% grade on my bike (real bike, not ebike) for one block, just to see if I could do it. Note that 22% is less steep than 22 degrees, but it’s still super steep. I did manage to do it, but I was in my granny gear and standing up the whole way.
Yes, I know. I engaged in a bit of hyperbole.
FWIW, I do try to pedal up every hill, even when it might seem to be faster to walk up, because I have been biking around Indiana (no mountains, but damn, are there hills everywhere) since I was 11, and I have learned that once you get off the seat, it’s hard to get back on, and I don’t even mean psychologically-- walking and pedaling use different muscles.
Getting off for a brief uphill walk, then getting back on is some kind of “tease” to your pedaling muscles, which I guess start going into recovery mode, then get jerked back into service. On a long ride, that can be tough.
When I used to bike to Nashville, IN from Bloomington (a little over an hour on a 10-speed non-electric at a leisurely pace), I’d encounter the “hill from hell.” The grade was steep enough, but mostly, it was a city block long, and here I’m not exaggerating. I timed it once, and it took more than 2 minutes, which might have been longer than walking. I was in my lowest (or highest, whatever) gear, almost standing, and on top of the hill was a short straightaway, then…another hill! a short one, but damn. I’ve driven that hill, and could never take it in higher than third gear, and that was only if I anticipated it, and built up speed. If there was traffic, I’d end up in second gear.
After hill #-fucking-2 was a downward slope that let you coast at close to 25mph, albeit was not as long as the uphill, but still, you could coast a very long way on the flat road that came after.
Going down that hill on the way back was not for the timid. Toward the bottom, my speedometer would hover at 26mph, and that was the only time or place I ever got that fast. Even if I tried to pedal, I couldn’t “catch” the gears.