Some type of FI would be nice on the 5.3. Went skiing this weekend and this was the first time taking the Suburban on I70. It definitely felt underpowered on a fast, high-elevation highway. In previous [turbo] cars, I could comfortably cruise at 80+ mph the whole way. However in the Suburban it was pretty much 60-65mph, any faster and the engine would be screaming at 4k+.