That argument seems ridiculous. Gasoline weighs 6.3 pounds per gallon and most cars have 15-20 gallon tanks, so if you keep your tank around half-full your car will be lighter by maybe 50 or 60 pounds. Any performance improvement from that would be imperceptibly small.
Sorry but this is just wrong. The difference in feeling after filling up a small car from empty is significant just for normal driving. Look at what people pay for making sports cars lighter - 50 pounds is a lot!
Even small cars weigh thousands of pounds. Fifty pounds is objectively not a lot. If you're trying to tell me you can tell a significant difference in performance and handling in a car with a 7-year-old in the backseat versus no 7-year-old in the backseat, well, I don't believe you at all.
I can feel that too. Or a suitcase in the back. It's absurd you're telling me I haven't experienced this.
Luckily I don't have to be concerned with what someone who can't notice that believes: it falls to you to explain why there are so many lightweighting products on the market. Why do BMW offer a carbon roof that reduces weight by 5kg? Why did pre-refill-ban F1 only do partial refills? Why do rally co-drivers sit lower than the drivers?
