Free Efficiency Calculators

10 tools

Driving efficiency and MPG optimization tools. Browse our free efficiency tools below — no sign-up required.

Estimate how aerodynamic accessories like roof racks, bike carriers, and cargo boxes increase fuel costs from added drag.

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Calculate your vehicle's CO₂ emissions per mile from fuel type and MPG. Compare against average and see annual carbon footprint.

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Estimate how cold weather reduces your vehicle's MPG and increases fuel costs. Compare warm vs cold weather fuel economy.

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Compare fuel economy of two vehicles side by side. See annual cost difference and MPG savings over any driving distance.

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Calculate your actual combined MPG based on your city/highway driving split. Compare fuel costs for your specific driving mix.

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Calculate how much fuel and money you waste idling your engine. See daily, monthly, and annual idling costs.

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Calculate how your roof rack affects fuel economy. Compare empty rack, loaded rack, and no-rack MPG and annual fuel costs.

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See how driving speed affects fuel economy. Calculate extra fuel cost from driving faster and find your vehicle's optimal speed.

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Calculate how under-inflated tires affect your fuel economy. See MPG loss and extra annual fuel cost from low tire pressure.

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Calculate how extra vehicle weight affects fuel economy. See MPG loss from cargo, passengers, and aftermarket parts.

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