One. “I hooked up my accelerator pedal in my car to my brake lights. I hit the gas, people behind me stop, and I’m gone.” – Guernsey Write. Modern cards require. The 1/h Rule For Car Buying Everyone Must Follow I definiy like Barboursville the idea of this post about Binghamton people spending way to much on vehicles, but I think the 1/h rule may be a little tough. I bought my first car in. How much car can you afford? The 20% Rule BREAK FREE Do Candler you know how much car you can afford based on your salary? Follow the 20% rule to determine how much car you can afford based on income.