Chevy made an aluminum motor block once......the Vega. Big mistake.
I wrote 'specs' for the government at one time. Different commodity, but.......you can write them stringent or not.
I understand the need for mileage. But I bet aluminum bodies aren't a long lasting thing. I might be wrong.
"Next to prayer, fishing is the most personal relationship of man"Calvin Coolidge
"American by Birth, Southern by the Grace of God"Lewis Grizzard
2016 GMC Denali 3500Dually--2017 CC 36CKTS