In Chevy vans it isn't a far fight. The choice is a 2.8L turbo diesel with an 8 speed or a 6.0L NA V8 with a 6 speed.
The Ford Transit has a fairer fight.
3.5L gas DI N/A V6
3.5L gas DI turbo
2.0L turbo diesel
All the engines get a 10 speed auto.
Given the current realities I can't see buying the diesel. Where I live diesel is more expensive than premium gas. Diesels have a particulate filter that will need to be replace somewhere around 120 - 150K miles. Expect to pay $4 - $5,000 for a shop to do it. Also, the fuel economy advantage isn't much between a DI turbo gas engine and a DI turbo diesel engine. It is basically just the extra energy content of the fuel.
My current TDI will be the last diesel I buy.
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