Inaccurate steps between two Blaze devices

[AmyCM]

I've had three other Fitbit devices and been very happy. My boyfriend and I have each just purchased the Blaze. We had been really happy untill the end of the first day and there was a major difference between our stepts and distances. 

We spent all day Saturday together, going to the same places and doing the same things all day (took the dog to the vet, cycled, beach, lots of walking the city). But at dinner time there is a 4,000+ step difference and over a mile's difference in our overall distances walked. I expected maybe 1,000 steps and maybe a half mile's difference between the two devices and our indevidual movements, not that much. 

Does anyone have a clue about what coule be going on?

[Rich_Laue]

If the two tracker a where on sesperate accounts but on the same person we could compare. Both accounts would also need to be setup the same.

Not knowing his height or your height gives us nothing to work with. Or how much of a difference is your strides.
As for mileage have you set the stride or let Fitbit determine it. Is Fitbit using your true stride?
Say one person has a stride that is 6 inches shorter they will be walking 520 more steps per mile.

Your Fitbit does not normally measure miles, it needs to calculate them, steps times stride equals distance.

With age gender weight height entered correctly will help Fitbit get close to what the stride should be, but it is better to calculate. 
Did one person use their hands more? They might have received more false steps. Have you set the dominant non-dominamt yet.
4k of steps in a day of 10k would be a lot, but if your day was 25k then it really is not much and can easily be explauned.
Start with bike riding, your Blaze most like is counting bumps, so whoever had the bum pier ride got the most steps.

The best way to test would be on a walk around the neighborhood, not by looking at total daily step counts.

[AmyCM]

Thanks for your tips!

Our stats from Saturday and our personal stats are:

Male:

Height 5'5"

Stride length 26.7" (it had been set automatically to 27" all day Sat)

Wearing on dominant hand, set to dominant hand

Total steps ~21,000

Total distance ~8 miles

Female:

Height 5'7"

Sride length 28.8" (it had been set automatically to 27.7" all day Sat)

Wearing on non-dominant hand, set to non-dominant hand

Total steps ~17,000

Total distance ~6.5 miles

We measured our stride length by walking 30' at least 3x each, averaging the number of steps the person took, and then took 30' divided by the number of steps. He averaged 13.5 steps per 30', and I averaged 12.5 steps, resulting in a 26.7" and 28.8" stride respectively, which wasn't set until Sunday. 

I apologize for the approximate steps and distances, our paths diverged for dinner. We did signifacantly different walking late Staurday evening and forgot to save our stats before separating. But these were the values that prompted my first post. 

The only other contributing factor could be that my boyfriend tends to talk with his hands and move his hands a lot more than I do, which could be counted as steps by the accelerometer. 

The next thing we could do is take a 10 min walk around the neighborhood and compare the number of steps taken in that 10 min period. But we wont have time for that until late today or later this week. 

Thank you for your help!