The ardunio mini pro use 10k resistor to pull up reset pin, but according to Atmega328p data sheet, the minimum value for reset pull-up resistor should be 30k (max is 60k).
I know 10k works well, but wouldn't using 30k as recommended in data sheet save more power ?
The internal pullup is a "weak pullup", on the order of 30K to 50K ohms.
Atmel recommends a 10K resistor for noisy environments.
See AVR042: AVR Hardware Design Considerations