2020 Civic vs Mazda3: Fuel Erases the Cheaper Sticker

The 2020 Honda Civic costs $24,893 to own over five years. The 2020 Mazda Mazda3 costs $25,135. That is a $242 gap in the Civic's favor, or about $4 a month: $415 for the Civic, $419 for the Mazda3.

The Civic wins, but only barely, and not for the reason most people expect. The Mazda3 is the cheaper car to buy, at an assumed $11,700 against $14,300 for the Civic. The Civic claws that back through fuel and repairs, which add up to more than the Mazda3 saves on depreciation and insurance. If you drive a lot, the Civic is the better buy. If you drive little, the Mazda3 deserves a look.

The sticker price is the Mazda3's best argument

Start with what the Mazda3 does well. Our estimate for a 2020 Mazda3 is $11,700. Our estimate for a 2020 Civic is $14,300. That is real money on day one, and for a buyer with a hard cash limit it may settle the question.

The lower price also shows up in the ownership figures. Over five years, the Civic loses $3,234 in value. The Mazda3 loses $2,799. That is $435 more depreciation for the Civic. A cheaper car has less value to lose, so this is no surprise.

Insurance leans the same way. Our estimate is $7,441 for the Civic and $7,070 for the Mazda3, which is $371 more for the Civic. Keep in mind that these insurance numbers are our estimate based on the car's value and class. They are not a quote. Your own rate depends on your age, your ZIP code, and your driving record, and it will differ.

Add those two together and the Mazda3 has an edge of $806 in the money-you-lose-on-paper categories. A fair question follows: why does it still lose?

Where the Mazda3 gives it all back

Fuel. That is the whole story.

Our calculator has the Civic at $8,352 for five years of gas. The Mazda3 comes in at $9,216. That is $864 more for the Mazda3. Monthly, the Civic averages $139 and the Mazda3 averages $154, a difference of $14 per month. It does not sound like much. Over 60 months it eats the Mazda3's depreciation and insurance advantage and then some.

The gap does not shrink as the years go by. In year one the Civic's fuel bill is $1,605 and the Mazda3's is $1,771. By year five, the Civic is at $1,737 and the Mazda3 is at $1,917. Both rise, and the Mazda3 stays higher the entire way.

If you want the official mileage ratings behind those dollar figures, look up the 2020 Honda Civic on fueleconomy.gov and the 2020 Mazda3 on fueleconomy.gov. Trim and engine choices matter there, so match the one you are actually shopping. We are talking about dollars, and in dollars the Civic is the thriftier car at the pump.

Then there are repairs. Our calculator has $2,311 for the Civic and $2,495 for the Mazda3 over five years. That is $184 more for the Mazda3. It is not a huge number, but it points in the same direction as fuel.

So the real story: the Mazda3 saves you money you never see (lower value loss, lower insurance) and costs you money you do see (gas and repair bills). The Civic is the reverse. In the end the visible costs win by a small margin.

Neither car gets cheaper, but the Mazda3 never catches up

Year by year, our calculator shows the Civic cheaper in every single one of the five years. Here is how the totals run:

• Year 1: Civic $4,487, Mazda3 $4,582
• Year 2: Civic $4,627, Mazda3 $4,674
• Year 3: Civic $5,746, Mazda3 $5,761
• Year 4: Civic $4,671, Mazda3 $4,700
• Year 5: Civic $5,362, Mazda3 $5,418

The Mazda3 gets closest in year three, when the two cars are within $15 of each other. That is the year of the big maintenance bill, $1,475 for both cars. Maintenance is identical, $3,300 over five years for each, with the same spikes in years three and five ($1,475 and $825). When both cars take the same hit, the gap shrinks because the Mazda3's lower depreciation matters more in relative terms.

Then the gap reopens. Repairs are the reason. Our repair estimates climb every year on both cars, but the Mazda3 climbs from a slightly higher starting point. The Civic goes from $257 in year one to $728 in year five. The Mazda3 goes from $277 to $785. Neither car is a repair disaster in our numbers, yet both get more expensive as the odometer climbs.

One more point on timing. Depreciation slows for both cars. The Civic loses $715 in year one and $582 in year five. The Mazda3 loses $702 and then $469. As the depreciation line shrinks, fuel and repairs make up more of the bill, and those favor the Civic. If you plan to keep the car longer than five years, the trend is not kind to the Mazda3.

Registration is a non-factor. It is $255 over five years for each car, with a higher first year ($91) and $41 after that.

Repair risk: a small edge, not a guarantee

Our repair figures are projections for a typical car in this age and mileage range. They are not a promise about the one you buy. Real repair costs come in lumps. A cheap year can be followed by a bad one, and averages hide that.

For a reality check, look at RepairPal, which publishes reliability ratings and typical repair costs by model. Pull up both the Civic and the Mazda3 and compare how often owners report unscheduled shop visits and what those visits cost. We are not going to quote its numbers from memory, because they change and you should see the current ones for the exact model year.

What we can say is what our calculator shows. The Civic is cheaper to repair in each of the five years, and the gap is $184 over the full period. That is the cost of about one decent brake job, or part of a single alternator replacement. It is a nudge, not a verdict.

So which car is more likely to surprise you with an expensive repair? Based on our figures, the Mazda3 has a slightly higher exposure, and its repair line grows a bit faster. But the difference is small enough that the condition of the specific car matters far more than the badge. A Civic with a spotty service history is a worse bet than a Mazda3 with every receipt in the glovebox.

The practical advice is boring and it works. Get a pre-purchase inspection from an independent mechanic. Ask for maintenance records. Budget for that year-three maintenance bill of $1,475, because it lands on both cars and people forget it.

Fuel is the line that decides this

It is worth spending another minute here, because fuel is the biggest single swing between these cars. The $14 per month difference in our calculator is easy to wave off. Nobody notices $14 in a month. But it comes out every month, and it comes out of your pocket directly, unlike depreciation, which you only feel when you sell.

Here is a useful way to think about it. The Mazda3's lower purchase price of $11,700 feels like a savings you collect once, up front. The extra gas is a bill you pay in small pieces for years. Over five years, our figures say the gas bill, $864 higher, is bigger than the savings the Mazda3 earns through lower depreciation, $435. Gas wins that matchup by a wide margin.

If your commute is short and the car mostly sits in a driveway, this changes. Fuel costs scale with miles. Drive less than our calculator assumes and the Mazda3's fuel penalty shrinks while its lower sticker price stays put. Drive more and the Civic pulls further ahead.

Who should buy which

Buy the Civic if you drive a lot or plan to keep the car. If you commute every day, take road trips, or expect to hold the car past the five-year mark, the Civic is the better fit. It is cheaper in all five of our year-by-year totals, it costs less to fuel, and its repair costs run lower. You pay more up front, at an assumed $14,300, and you lose more value on paper. But you pay less in the categories that keep recurring. It is also the safer pick for anyone who hates opening a repair estimate, since our numbers give it the slight edge on repairs.

Buy the Mazda3 if cash on hand matters more than the long run, and you do not drive much. At an assumed $11,700, it asks for less money at the start. If you are financing, that means a smaller loan. If you are paying cash, it leaves room for the inspection and a maintenance cushion. It also has lower insurance in our estimate ($7,070 against $7,441), and it holds on to a bigger share of its value. For someone with a short commute, or a second car that logs few miles, the fuel penalty stays small and the lower price does the work. Just do not pretend it is the cheaper car to own. Over five years of normal driving, it is not.

The bottom line

A $242 gap over five years is thin. Nobody should pick a car on that alone. But it tells you something: the Mazda3's low price is not a free lunch, and the Civic's higher price is not a rip-off. Our calculator says the Civic costs $24,893 and the Mazda3 costs $25,135, and the difference comes down to gas and repairs.

If you drive average miles or more, buy the Civic. If you drive less than average and need to keep the purchase price low, buy the Mazda3 and accept that you will pay it back at the pump.

Whichever you choose, get your own insurance quote before you sign, and have a mechanic look the car over. Those two steps will move your real costs more than anything in this comparison.