@Smergen have they changed the fuel filler size?
Not sure about other brands, ford Mazda ect but the colorado has a small opening so it makes it pain when you get a high flow pump.
When ive got the van on the back I just pull up to the easiest pump and it's usually high flow and when you got to fill it up it seems to take longer because your trying not to get diesel everywhere.
Thats a easy fix, I just took the filler neck out and die grinded out that meal out that stops the high flow nozzles from entering and it still looks factory.