This is partly a cultural thing. Before we moved here from UK I never ate or drank in the car and didn't even consider it in GA context. However now I am, I'm afraid, pretty well N amercanised. I wear runners, well cheap imitations all the time and my family can't get to the other end of the vilage without taking a couple of cups of cofffee ad some malodourous snack with them.
When I was a kid we were driving back from Whitstable one late evening in my ranfather's new Sunbeam Talbot. Uncharacteristically we stopped to buy fish and chips in Rochester , the main road used to go right down the hill through the main street. The car smelt of food and vinegar for months and it became a standing joke in my family. I don't think I ate anything more that a boiled sweet in a car until I moved here 40 years later.
My cockpit is so noisy I had to turn the mic gain all the way to the bump stop just to cut out as much noise as possible, (there is no adjustment on the actual radio input) I spent a whole month looking for the source of a particular squeaking that seemingly was tied to an engine fluctuation until I worked out it was my chewing gum and the echo from my mouth opening when I chewed. I know I close my mouth when I chew in company, apparently I am a bit slck jawed when I'm by myself! (Or maybe just gormless.)