Petrol vs. Electric Car in Chennai: A 3-Year Cost Comparison

Every time you pull into a petrol bunk in Chennai, you see the meter ticking up.

"₹100.85 per litre."

It stings, doesn't it?

Meanwhile, you have friends on OMR who plug their cars in at night like a smartphone and claim they spend "almost nothing" on fuel.

Is it true? Or is it just EV hype?

At SMK MG, we believe in math, not marketing. Let’s sit down and calculate the actual cost of owning a Petrol SUV vs. an Electric SUV in Chennai over 3 years.

(Note: We are comparing a typical compact SUV usage in Chennai—driving from Adyar to Siruseri daily, plus weekend trips).

1. The Fuel Cost: The Big Divider

Let’s assume you drive 1,200 km per month (approx. 40 km daily).

Option A: The Petrol SUV

Real-world Mileage: ~12 km/l (City + Highway mix).

Petrol Price (Jan 2026): ₹101 per litre.

Monthly Cost: (1200 / 12) * 101 = ₹10,100.

3-Year Fuel Cost: ₹3,63,600.

Option B: The MG ZS EV

Real-world Range: ~350 km per full charge.

Battery Size: 50.3 kWh.

Electricity Tariff: Approx. ₹8 per unit (Residential slab average).

Cost Per Full Charge: 50.3 * 8 = ₹402.

Cost Per KM: ₹402 / 350 km = ₹1.15 per km.

Monthly Cost: 1200 * 1.15 = ₹1,380.

3-Year Charging Cost: ₹49,680.

The Savings: You save ₹3.1 Lakhs on fuel alone in just 3 years. That’s enough to fund a family vacation to Europe!

2. Service & Maintenance: The Silent Saver

Petrol cars have thousands of moving parts. Pistons, spark plugs, timing belts, oil filters.

An EV has... a motor and a battery.

Petrol Service Cost (3 Years): You will do roughly 3 major services.

Oil changes, filter replacements, brake pads, etc.

Estimated Total: ₹45,000 - ₹50,000.

EV Service Cost (3 Years):

Cabin air filter, coolant check, tyre rotation.

Estimated Total: ₹15,000 - ₹18,000.

3. The "Hidden" Road Tax Benefit (2026 Update)

This is the biggest immediate saving that people forget.

As of January 2026, the Tamil Nadu Government has extended the 100% Road Tax Exemption for EVs until the end of 2027.

Petrol Car (Ex-Showroom ₹15 Lakhs): Road Tax is ~15%.

You Pay: ₹2.25 Lakhs extra.

Electric Car (Ex-Showroom ₹18 Lakhs): Road Tax is 0%.

You Pay: ₹0.

Result: The "expensive" EV is actually cheaper to put on the road because you aren't paying that massive tax bill.

4. Resale Value: The Future Market

"But won't the battery die?"

This is an outdated fear. Modern LFP batteries (like in the ZS EV) are rated for 2,000+ cycles. That’s roughly 5 Lakh Kilometers.

In 3 years, the demand for used EVs in Chennai is projected to skyrocket as fuel prices likely inch higher. A well-maintained EV with 85% battery health will command a premium price in the second-hand market compared to a petrol car that is getting older and thirstier.

Conclusion: The Math Doesn't Lie

Owning a petrol car in Chennai costs you nearly ₹5.6 Lakhs MORE over just 3 years.

Even if the EV costs ₹2-3 Lakhs more to buy upfront, you break even in roughly 18 months. After that? You are practically driving for free.

Still undecided?