The 2001 GMC Sierra-2500HD runs on regular unleaded.
The 2001 GMC Savana runs on regular unleaded.
The 2001 GMC Yukon runs on regular unleaded.
The 2001 GMC Yukon-XL runs on regular unleaded.
The 2001 GMC Sierra-1500 runs on regular unleaded.
The 2001 GMC Savana-Cargo runs on regular unleaded.
It's worth about $13,000. See quotes at http://www.edmunds.com/gmc/sierra2500hd/2006/index.html
in the fuel tank
The 2001 GMC Savana has a 4-speed automatic.
The 2001 GMC Yukon has a 4-speed automatic.
Gmc does not use inertia/reset switches.
The 2014 GMC Savana runs on flex-fuel (FFV).
The 2010 GMC Savana runs on flex-fuel (FFV).