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Fuel Cost Calculator
Calculate your exact fuel cost per mile, per trip, and monthly gas expense based on your vehicle MPG and local gas price. Understand your true cost of driving and compare different vehicles fuel efficiency.
Fuel is one of the largest ongoing vehicle expenses. At $3.50 per gallon with a 25 MPG car, every mile costs 14 cents — that adds up to $2,100 per year for the average driver covering 15,000 miles. Knowing your exact fuel cost per mile helps you budget accurately and compare vehicle options.
Formula
Fuel Cost = Distance / MPG × Gas Price | Cost per Mile = Gas Price / MPG | Monthly Cost = Monthly Miles / MPG × Gas Price
Understanding Your True Fuel Cost
Fuel cost is the most variable operating expense of any vehicle. It depends on three factors: how far you drive, how fuel-efficient your vehicle is (MPG), and how much fuel costs in your area. Small improvements in any of these factors can save hundreds of dollars per year.
Average Fuel Costs by Vehicle Type
Vehicle Type
Avg MPG
Cost/Mile @ $3.50/gal
Annual Cost
Compact Car
35 MPG
$0.10/mile
$1,500/yr (15k mi)
Midsize Sedan
30 MPG
$0.12/mile
$1,750/yr
SUV / Crossover
25 MPG
$0.14/mile
$2,100/yr
Pickup Truck
20 MPG
$0.175/mile
$2,625/yr
Large SUV / Truck
15 MPG
$0.23/mile
$3,500/yr
Hybrid
50 MPG
$0.07/mile
$1,050/yr
Electric Vehicle
3.5 mi/kWh
$0.03-0.05/mile
$450-750/yr
Tips to Reduce Fuel Costs
Proven fuel-saving techniques: maintain proper tire inflation (underinflated tires reduce MPG by 0.2% per PSI below recommended), remove excess weight from the car, use cruise control on highways (saves 7-14% fuel), accelerate gradually and brake smoothly, avoid idling (costs 0.25 gallons/hour), use the recommended fuel grade, and keep the engine properly maintained (dirty air filters reduce MPG by up to 10%).
Gas Price Tracking
Gas prices vary by region, season, and crude oil markets. US average: $3.00-4.00/gallon regular. California consistently highest ($4.50-6.00). Gulf Coast states lowest ($2.80-3.20). Gas is typically 20-30 cents cheaper at warehouse clubs (Costco, Sam's Club) but requires membership. GasBuddy app shows real-time prices at nearby stations.
Frequently Asked Questions
Fuel cost per mile = Gas price per gallon / MPG. At $3.50/gallon and 28 MPG: $3.50 / 28 = $0.125 per mile. For annual cost: $0.125 × 15,000 miles = $1,875/year. This is one of the most useful numbers for comparing vehicles and calculating trip costs.
At $3.50/gallon: 20 MPG car = $17.50, 25 MPG = $14.00, 30 MPG = $11.67, 35 MPG = $10.00, 40 MPG = $8.75. Formula: Cost = 100 miles / MPG × gas price. Every 5 MPG improvement saves $1-4 per 100 miles depending on gas price.
Average US driver travels 1,250 miles/month. At 25 MPG and $3.50/gas: 1,250/25 × $3.50 = $175/month. At 20 MPG: $219/month. At 35 MPG: $125/month. Annual difference between 20 MPG and 35 MPG vehicle at $3.50 gas: ($219-$125) × 12 = $1,128 saved per year.
Annual savings = Annual miles × Gas price × (1/Old MPG - 1/New MPG). Switching from 20 MPG to 30 MPG at $3.50 gas, 15,000 miles/year: 15,000 × $3.50 × (1/20 - 1/30) = $52,500 × 0.01667 = $875/year. Over 10 years: $8,750 in fuel savings.
Fuel economy peaks around 45-55 mph for most vehicles. Above 55 mph, aerodynamic drag increases rapidly — fuel economy drops about 2% for every 5 mph over 50 mph. At 70 mph vs 55 mph: 17% more fuel consumption. Slowing from 70 to 60 mph on a highway road trip saves approximately $5-8 per tank.
Calculate break-even: Extra miles × (fuel cost per mile for your car) vs savings per gallon × tank size. If a station 5 miles away saves $0.20/gallon and your tank holds 15 gallons: saves $3.00 but costs 10 miles × $0.14/mile = $1.40. Net savings: $1.60. Worth it for large tanks and significant price differences.