Buses are built to order, so the customer chooses from a list of available features. The aforementioned 454 big block had been discontinued by the 2011 model year, and 2000 was the last MY that engine was available in the Chevrolet Express (which would be the chassis used for a school bus). If it has a gas engine, it most likely has the 6.0. The 4.3 V6, 4.8 V8, and 5.3 V8 are other possibilities, in accordance with what the original customer specified. If it's a diesel, it'll have the 6.6 Duramax.
Depends on the model...
129 mph depending on the engine size
No
The 2011 Volvo XC90 has a 3.2 L base engine size.
The 2011 GMC Canyon has a 2.9 L base engine size.
The 2011 Toyota RAV4 has a 2.5 L base engine size.
The 2011 Toyota Prius has a 1.8 L base engine size.
The 2011 RAM 1500 has a 3.7 L base engine size.
The 2011 Toyota Avalon has a 3.5 L base engine size.
The 2011 Lincoln Navigator has a 5.4 L base engine size.
The 2011 Chevrolet Tahoe has a 5.3 L base engine size.
The 2011 Nissan Frontier has a 2.5 L base engine size.