First tank of fuel on a road trip (and failing with our AMSOIL diesel additive) - capless fuel fill
Bryan Frambach Bryan Frambach
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 Published On Dec 4, 2019

635.2 miles on one tank of diesel. Averaged 25.9 mpg according to the on-board computer. However, when we figured it longhand, we got 27.7mpg!
The AMSOIL product I'm attempting to use this time is ADBP-CN which is the All-In-One product for diesels - cetane boost, lubricity improver, and cold flow improver.
The 2020 Silverado has a 'capless fuel fill.' Apparently, GM has the answer to the question nobody's asking. I don't like the capless. It seems that this design will invite dirt and debris into the fuel system (I'm aware of the TWO trap doors - but they swing inward. Anything on the trap door, falls down into the tank) and makes using additives a pain in the rear.
I have been using this product every-single-tank, but I've been using the big bottle (half gallon) and using a funnel. Dealing with the funnel and measuring and everything, I decided that for our roadtrip, I would just use the little bottle. Pour in, fill-up, and go... in theory.

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