2026 BMW i4 eDrive40 vs 3-Series 330i: Which Costs Less to Own When EV Depreciation Is Accelerating?
2026 BMW i4 eDrive40 vs 3-Series 330i: Which Costs Less to Own When EV Depreciation Is Accelerating?
You're standing at the BMW dealership — or more likely, you're deep in a browser tab at 11pm — staring at two versions of essentially the same car. The 2026 BMW i4 eDrive40 and the 330i sedan occupy the same parking space in your imagination, cost within $15,000 of each other on the sticker, and both promise the same Bavarian driving experience. One plugs in. One fills up.
The salesperson will tell you the i4 "pays for itself in gas savings." Your gut says the electric version probably depreciates faster. Neither of you is running the actual math.
Here's the thing: this decision can't be made in your head. The answer depends on your electricity rate, your annual mileage, your insurance tier, your local gas prices, and — most critically — what BMW's shifting EV strategy does to your car's resale value five years from now. Let's walk through a real worked example, and then be honest about how much your numbers could differ.
The Sticker Price Is Just the Beginning
A 2026 BMW i4 eDrive40 starts at roughly $57,900. The 330i sedan sits around $44,900 at base. That's a $13,000 gap before you even leave the lot.
The standard EV pitch goes like this: electricity is cheaper than gas, EVs need less maintenance, so the savings will close that gap over time. That pitch is partially true. Here's where it breaks down.
Fuel and maintenance over five years (baseline scenario: 12,000 miles/year, $3.80/gallon, $0.15/kWh home charging):
| Cost Category | BMW i4 eDrive40 | BMW 330i | i4 Advantage |
|---|---|---|---|
| Electricity vs. gas (5yr) | ~$3,000 | ~$7,100 | Save $4,100 |
| Maintenance (5yr) | ~$3,000 | ~$6,000 | Save $3,000 |
| Insurance (5yr, est.) | ~$12,000 | ~$10,500 | Costs $1,500 more |
| Operational savings | ~$5,600 net |
So far, so good. The i4 saves you roughly $5,600 in running costs over five years. But you started $13,000 in the hole. That leaves a $7,400 gap that only one thing can close: depreciation — and right now, that's the number working against you.
The Depreciation Variable Nobody Talks About at the Dealership
This is where the math gets brutal, and it's the reason this decision can't be simplified.
Luxury EVs from legacy automakers are depreciating hard. iSeeCars data consistently shows luxury battery-electric vehicles losing 45–55% of their value within five years — significantly faster than their gas equivalents. For the i4, a conservative 50% depreciation estimate over five years means you lose roughly $28,950 from a $57,900 purchase.
The 330i? BMW gas sedans have historically held value better. At roughly 40% depreciation over five years, you lose about $17,960.
That's an $11,000 depreciation gap — and it nearly doubles the cost disadvantage the i4 already faced from the sticker price.
Full 5-year cost of ownership, worked example:
| BMW i4 eDrive40 | BMW 330i | |
|---|---|---|
| Purchase price | $57,900 | $44,900 |
| Est. residual value (5yr) | $28,950 | $26,940 |
| Fuel + maintenance + insurance | $18,000 | $23,600 |
| Net 5-year cost | ~$46,950 | ~$41,560 |
| Difference | 330i saves ~$5,400 |
In this scenario, the 330i costs about $5,400 less over five years despite burning gasoline. The i4's operational savings are real — they just aren't big enough to overcome the depreciation drag.
But — and this is critical — your numbers will look completely different depending on your electricity rate (California's average is over $0.27/kWh, not $0.15), your annual mileage (a 20,000-mile/year driver flips this math), your insurance tier, and where the used BMW EV market actually lands five years from now. This is the kind of multi-variable comparison DriveDecision is built for — it runs all five cost dimensions simultaneously so you're not guessing at which variable matters most for your situation.
Why the Depreciation Risk Is Higher Than Ever Right Now
Here's what the headlines this week are telling us, and why it matters for this specific decision.
According to reporting by Carscoops, legacy automakers have collectively absorbed more than $70 billion in EV-related losses, with Honda joining the list of manufacturers pulling back on aggressive electrification timelines. When automakers retreat from EV commitments, it signals softening demand — and soft demand for new EVs means accelerating depreciation for used ones.
At the same time, BMW just confirmed that its upcoming next-generation 3-Series will maintain combustion powertrains on a revised platform alongside an electric i3 sedan. That's BMW explicitly hedging: they believe gas 3-Series buyers will still be there in 2027 and beyond. The implication for today's i4? BMW itself is telegraphing that the electric-only path isn't a foregone conclusion, which creates residual value uncertainty for current EV buyers.
We've seen this movie before. As covered in our analysis of the Hyundai Ioniq 6 N versus Lexus UX 300e discontinued EV scenario, when a manufacturer signals uncertainty about an EV line — through model changes, production cuts, or platform pivots — the depreciation curve for current owners steepens fast. The i4 isn't discontinued, but the broader market signal matters.
And over on the performance side, Mercedes-AMG is reportedly developing an electric C-Class with up to 800 horsepower — a direct competitor to BMW's electric performance flagship territory. More competition in the luxury EV segment means more supply pressure on resale values across the board.
The Plot Twist: The Used i4 Flips the Math
Here's where the story gets genuinely interesting, and it connects directly to a trend gaining momentum in 2026.
According to Carscoops, the used EV market is heating up as buyer hesitation fades and more models flood the secondary market. Early EV adopters are now trading in 2021–2023 models, and those cars are available at 35–45% below their original sticker prices.
A used 2023 BMW i4 eDrive40 in good condition can be found for around $34,000–$38,000 — meaning someone else already absorbed the steepest part of that depreciation cliff. You get the same low operating costs, the same driving experience, and you've sidestepped the worst five years of value loss.
That changes the math entirely. If you're comparing a used 2023 i4 at $36,000 against a new 2026 330i at $44,900, suddenly the EV is cheaper to purchase and cheaper to operate and faces a flatter remaining depreciation curve. This is the same dynamic we analyzed in the used 2022 Toyota Corolla versus new 2026 comparison — when used prices drop significantly, the total cost picture inverts. You can model this exact scenario for your own vehicle shortlist at DriveDecision.
The Variables That Determine Your Answer
Here's what makes this impossible to resolve without your personal inputs:
Electricity rate: If you're in Louisiana at $0.11/kWh, the i4's fuel savings are meaningful. If you're in California at $0.28/kWh, you're barely saving anything over gas, and the depreciation drag dominates.
Annual mileage: At 8,000 miles/year, the fuel savings shrink to almost nothing. At 20,000 miles/year, the i4 becomes significantly more competitive.
Depreciation trajectory: If BMW's EV commitment strengthens (federal incentives return, Neue Klasse technology impresses buyers, the used EV market stabilizes), the i4's residual value improves. If automaker retreats continue, it worsens. As we noted in our look at EV depreciation dynamics, the paradox is that fast depreciation hurts current owners but creates deal opportunities for the next buyer.
New vs. used: Are you buying new or shopping for a used i4? That single variable can swing the five-year calculation by $8,000–$12,000.
Insurance: Luxury EV insurance runs higher than equivalent gas models due to repair costs and parts availability. The gap varies significantly by zip code, driver history, and insurer.
So Which One Should You Buy?
In the specific scenario we modeled — new i4 vs new 330i, 12,000 miles/year, average electricity and gas prices — the 330i wins by about $5,400 over five years. That's not a runaway victory for gas, but it's real money that the "just look at gas savings" narrative misses entirely.
Change the inputs, though, and the answer changes. A high-mileage driver in a low-electricity-cost state who shops for a used 2023 i4 could easily find the electric option $10,000 cheaper over five years than a new 330i.
That's why the right question isn't "is the i4 worth it?" — it's "is the i4 worth it for my mileage, my electricity rate, my zip code, and my preference for new versus used?"
Run your actual numbers at DriveDecision. Input both vehicles, your annual mileage, and your location, and the calculator handles the depreciation curves, fuel cost projections, insurance estimates, and maintenance differences simultaneously — all five dimensions at once, so you're making this decision with real math instead of dealership talking points.
The i4 might be the right call for you. The 330i might be. But neither answer is obvious until you run your numbers.
Sources
- America’s Used EV Market Is Heating Up For One Simple Reason — Carscoops
- Mercedes-AMG Turns Electric C-Class Up To 11, Power Up To 800 HP — Carscoops
- The Next 3-Series Shares BMW’s Future Look, But Not The Same Foundations — Carscoops
- EV Bets Already Cost Four Legacy Carmakers $70B, And The Tab Keeps Climbing — Carscoops
- Lexus’ $100,000 Luxury Minivan Picks Up A Few Strange New Tricks — Carscoops