It depends. Need the following:
Percent grade
Barometric pressure
Ambient temperature
gear combination
type of bike
tubed or tubeless
aero clothing?
just eaten a big meal or not
feeling strong that day
had argument with significant other
underlying health conditions
type of tools you carry
had marital relations that day or other
experience level
eaten at Taco Bell
clipless pedals or flats
head or tail wind
PSI in tires
Drafting or not
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Road 🚴🏾♂️ & Mountain 🚵🏾♂️