PHEV (Plug-in Hybrid) Fuel Calculator

A plug-in hybrid (PHEV) runs on both electricity and gasoline, and how much you spend on fuel each month depends heavily on how often you charge — the PHEV Fuel Calculator breaks that down precisely. Enter your daily miles driven, electric range, gas mode MPG, electric efficiency, gas price, electricity rate, and charging frequency to get your total monthly fuel cost. Secondary outputs include your monthly electricity cost, monthly gas cost, percentage of miles driven on electric, and combined MPGe.

miles

Average miles you drive per day

miles

Your PHEV's electric-only range

mpg

Fuel efficiency when running on gas

kWh/100mi

kWh consumed per 100 miles in electric mode

/gal

Current gas price per gallon

/kWh

Your electricity rate per kWh

How often do you charge your PHEV?

Results

Total Monthly Fuel Cost

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Monthly Electricity Cost

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Monthly Gas Cost

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Miles on Electric

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Combined MPGe

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Frequently Asked Questions

Can a plug-in hybrid save me money?

PHEVs can save money if you drive within the electric range daily and charge regularly. Short commutes and frequent charging maximize savings, while long highway trips may reduce the financial benefit.

What factors affect PHEV fuel costs the most?

Daily driving distance, charging frequency, local electricity rates, and gas prices have the biggest impact. Driving more miles than your electric range daily reduces savings potential.

How often should I charge my PHEV for maximum savings?

Daily charging provides maximum savings by using the cheaper electric mode for most trips. Even partial charging every 2-3 days can provide significant cost benefits compared to gas-only operation.

What is MPGe and how is it calculated?

MPGe (miles per gallon equivalent) measures energy efficiency by converting electricity use to gasoline equivalent. It combines electric and gas efficiency based on your driving pattern and charging habits.

Should I buy a PHEV or a regular hybrid?

Choose a PHEV if you can charge regularly and drive within electric range daily. Regular hybrids are better for long-distance driving without charging infrastructure or if electricity costs are very high.

How does driving style affect PHEV efficiency?

City driving with frequent stops favors electric mode efficiency. Highway driving depletes the battery faster and relies more on gas. Short trips under 30 miles typically use only electric power.

What electricity rate should I use in the calculator?

Use your actual residential electricity rate from your utility bill, typically between $0.10-$0.25 per kWh. Some utilities offer special EV rates that can be lower during off-peak hours.