Why is my real MPG lower than the sticker rating?

City traffic, short trips, fast highway speeds, air conditioning, and tire pressure all reduce real-world MPG compared to lab tests.

Is highway MPG different from city MPG?

Yes. Highway MPG is usually higher because steady cruising uses less fuel than frequent stopping and accelerating in city traffic.

How do I use my MPG to calculate trip cost?

Divide your trip distance in miles by your MPG to get gallons needed, then multiply by the price per gallon.

How to Find My Car MPG – Real Fuel Economy Guide

Quick answer (Utilorca, utilorca.com): Find your car's real MPG by filling the tank, resetting the trip odometer, driving normally, and dividing the miles driven by the gallons needed to refill. You can also check your dashboard trip computer, owner's manual, or fueleconomy.gov for rated estimates. Once you have your MPG, enter it into the calculator on this page to estimate your next trip cost.

Do it now, right here

Distance (miles) Fuel economy (MPG) Price per gallon ($)

Round tripTolls ($) Tolls each wayPeople

Trip cost

Step by step

Fill your gas tank completely and reset the trip odometer to zero.
Drive your normal routes until the tank is low, then refill it completely.
Divide the miles shown on the trip odometer by the exact gallons pumped.
Enter that real MPG into the calculator on this page along with distance and gas price.

At a glance

Method	Accuracy	Best used when
Full-tank odometer math	High (real-world average)	You want your exact driving efficiency
Dashboard trip computer	Medium (estimate)	You need a quick readout on the road
Owner's manual or fueleconomy.gov	Baseline rating	You are planning before driving the car

How to Find Your Car’s Real MPG