you ain't getting 27mpg on a toyota! i have always been a fan of toyotas, and still am, but they don't great gas mileage, they are rough riding compared to your colorado. i bet if you drove a tacoma for a week, on and off road, you would be wanting back in your chevy... they are just more comfortable.
my 19' taco got around 18mpg after i blew out a stock tire and put 10 ply tires on (that's all i use, lose some gas mileage, but i like the reliability in the mountains)
on a side note, Toyotas are pretty damn American, more so than most "American" auto companies. they make more of their vehicles here than most anyone.... if you are a diehard "American made" then you can't rule out Toyota for that reason.
years ago i got a S-10 ZR2, coming from a Toyota tacoma, and man that thing rode nice off road vs my taco. the newest version of Tacomas ride a lot better, but not near as nice as my ZR2... crazy comfort difference off road. that multimatic suspension on the ZR2 is amazing, but the Z-71's are nice riding too compared to a taco.
i don't get great mpg in my colorado, about 17-18, but it's way peppier than my tacoma was.... such a fun little pickup to drive. i go through rigs every 2-3yrs, but the ZR2 isn't going anywhere.... there is nothing better on the market for me.