Good question, and one that I can't answer truthfully as I have never driven the truck at sea level. I live at 7,350' above sea level and the maximum speed limit out of town is a hair-whooshing 50 kmph, so she never really gets a workout!
However, the 120 certainly didn't struggle at 13,000', so imagine the FI, ECU and turbo were working hard to try and make no real noticeable difference to the vehicle performance...
The truck had a full body polish a couple of weeks ago, and it hasn't rained here since early October when the monsoon finished, so dust is the issue here, not dirt!
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