In the UK, the speedo on vehicles is allowed to read up to 10% high but may not read anything lower than actual.The Sat Nav is inclined to be more accurate for obvious reasons.
I'm curious as to whether you run the headlight during daytime runs, (i.e. all the time), and the heated gloves are on top of that. My own bike is too new to make any conclusions but I do have the lights on all the time .
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