Fuel Cost Calculation: Planning Road Trips Without Guesswork
I used to guess how much a road trip would cost in gas. After tracking actual fuel use for a year, I built a system that predicts costs accurately. I used to estimate road trip fuel costs by guessing a rough amount and adding a buffer. After a trip came in significantly over budget, I started tracking my car actual fuel efficiency and built a simple system to predict costs. The math is straightforward, but getting the inputs right is what makes the estimate accurate. Here is how I calculate fuel costs for any trip. The Basic Formula Fuel cost is distance divided by fuel efficiency, multiplied by the price per unit of fuel. Distance is in miles or kilometers. Efficiency is in miles per gallon or liters per 100 kilometers. Price is per gallon or per liter. Fuel needed = distance / efficiency Fuel cost = fuel needed * price per unit Example: 400 miles, 30 MPG, 3.50/gal Fuel needed = 400 / 30 = 13.3 gallons Fuel cost = 13.3 * 3.50 = 46.67 For a 400 mile trip in a car that gets 30 miles per gallon, with gas at 3.50 dollars per gallon: fuel needed is 400 divided by 30, about 13.3 gallons. Cost is 13.3 times 3.50, about 46.67 dollars. This is the core calculation, and it is accurate when the inputs are accurate. The problem is that most people use the wrong inputs.