The question
Rachel is 35 years old and works as a freelance outdoor writer and photographer. She lives in Golden, Colorado — at the base of the Rocky Mountain foothills, about 20 minutes west of Denver. Her work takes her to trailheads across the state: Rocky Mountain National Park, Indian Peaks Wilderness, the San Juans in southern Colorado, occasional trips to Utah's canyons. Her driving is a mix of local commuting, weekly trailhead access, and roughly monthly longer-distance photography assignments. Annual mileage settles at around 18,000 — above the American average, well below what a full-time road warrior does.
Rachel has driven Subarus for the past twelve years — first a Crosstrek, currently a 2019 Forester Sport. Subaru loyalty runs deep in her outdoor community. When she started thinking about her next vehicle, she assumed she'd get another Forester, probably the Wilderness trim for its increased ground clearance and off-road tires. Then a friend mentioned the Solterra. Rachel was initially dismissive — Subaru's first EV had reviewed poorly at launch, and outdoor EV skepticism runs high. But she agreed to run the numbers before dismissing it outright.
Her constraints: 18,000 miles a year, cash purchase, five-year ownership horizon, and a garage at her Golden home already wired for Level 2 charging (previous owner installed for a Tesla — no infrastructure cost). Comparison: 2025 Subaru Forester Wilderness (gas) vs. 2025 Subaru Solterra Premium AWD (EV).
The vehicles
2025 Subaru Forester Wilderness
$36,000
- Combined MPG26
- CategoryCompact SUV · Off-road AWD · 9.2" ground clearance
- Depreciation model9% / yr (Subaru top-5 retention)
2025 Subaru Solterra Premium AWD
$40,000
- Efficiency36 kWh / 100 mi (altitude & cold adjusted)
- CategoryCompact crossover · AWD · 8.3" ground clearance
- Depreciation model16% / yr (Solterra weak retention — Subaru's first EV)
The 5-year math
| Forester Wilderness | Solterra Premium | |
|---|---|---|
| MSRP | $36,000 | $40,000 |
| Depreciation (5-yr loss) | $13,535 | $23,272 |
| Fuel or electricity (5-yr) | $11,250 gasoline | $3,888 electricity |
| Insurance (5-yr) | $6,750 | $7,500 |
| Maintenance (5-yr) | $3,250 | $2,500 |
| State incentive | — | −$5,000 (CO EV tax credit) |
| 5-year true cost to own | $34,785 | $32,160 |
| Difference | Subaru Solterra wins by $2,625 — the CO credit is decisive | |
Assumptions: Rocky Mountain gasoline at $3.25/gal (EIA PADD 4 average, Colorado moderate gas tax). Xcel Energy Time-of-Use with EV rider blended at $0.120/kWh (matches our original Denver case study assumptions for Xcel service territory). Solterra efficiency at 36 kWh/100mi represents altitude- and cold-adjusted annual average: EPA-rated 34 kWh/100mi combined AWD, with 2 kWh/100mi added for Colorado altitude and mountain elevation gains. Insurance from Drive Economics's density-and-MSRP model for a Denver metro ZIP. Maintenance from make and category (Subaru mainstream gas with slight Wilderness trim premium for off-road use; Subaru EV multiplier applied). Depreciation is geometric. Subaru retention is among the strongest in the industry — Forester Wilderness at 9%/yr reflects this. Solterra at 16%/yr reflects Subaru's first EV launched with mixed reviews and heavy 2024-2025 price cuts. Colorado EV tax credit is $5,000 for new EV purchases under $80,000 MSRP (Solterra qualifies). Federal EV tax credit expired September 30, 2025 and is excluded. See methodology.
The verdict
The Solterra wins by $2,625 over 5 years. What makes this case instructive is how load-bearing the Colorado tax credit is. Remove that single $5,000 line item and the Forester wins by $2,375. The entire outcome pivots on state policy.
Here's the structure of the math:
The Solterra saves $7,362 in fuel cost at Rachel's 18,000 miles a year — Colorado's mid-range gasoline pricing combined with the Forester Wilderness's 26 MPG (off-road tires reduce efficiency vs. the standard Forester's 29 MPG) produces real ongoing operating cost differences. The Solterra also saves $750 in maintenance and captures $5,000 from Colorado's EV tax credit. Total advantages: $13,112.
But the Solterra loses $9,737 more in depreciation (the $4,000 higher MSRP compounded by 16%/yr weak retention vs. Subaru gas platforms' 9%/yr strong retention) and $750 more in insurance. Total disadvantages: $10,487.
Net: $13,112 in advantages minus $10,487 in disadvantages equals a $2,625 EV win.
The larger story here: Subaru's EV story is Subaru's brand story working against them. Their gas platforms retain value like almost nothing else in the industry — Foresters routinely hold 55–65% of their value at five years. The Solterra can't compete with that pedigree because it doesn't have the track record. Even a modestly-priced EV loses to a Subaru gas platform on the depreciation dimension. That gap needs to be closed by fuel savings, incentives, or both — and in Rachel's case, the state credit is what closes it.
For Rachel specifically, the decision comes down to how she feels about the trade-offs. The Solterra saves her money over 5 years, but she gives up: proven long-term reliability (Subaru gas is legendary), off-road capability at trailheads (the Wilderness has better ground clearance and off-road-tuned suspension), and the towing capacity she occasionally uses for a small utility trailer. The math says EV, but the math isn't the only variable.
What could change this
- Colorado credit expires or reduces. The CO EV tax credit is one of the last remaining substantial state EV credits still active. If reduced to $2,500 (its predecessor level), the Solterra's advantage drops to $125 — essentially a tie. If eliminated entirely, the Forester wins by $2,375.
- Higher mileage widens the EV win. At 22,000 mi/yr the Solterra's advantage grows to roughly $4,700 (fuel savings compound). Rachel's outdoor lifestyle could plausibly push her mileage higher in years with heavy assignment travel.
- Lower mileage flips the outcome. At 12,000 mi/yr the Forester wins by about $700 — fuel savings can't overcome the sticker premium and weak retention at moderate usage.
- Serious off-road use. The Wilderness has meaningfully better off-road capability — 9.2" ground clearance vs. the Solterra's 8.3", off-road tires, off-road suspension tuning, X-MODE with hill descent control. For Rachel's regular Forest Service road access and occasional dirt trail driving, the Wilderness is measurably more capable. This is real value the math doesn't capture.
- Solterra retention improves. Toyota (Solterra's development partner) has hinted at continued Solterra platform investment. If Solterra retention stabilizes at 13%/yr matching the bZ4X, depreciation drops by roughly $4,700 — pushing the Solterra advantage to about $7,300.
- Federal EV credit reinstated. The prior $7,500 credit expired September 30, 2025 and is excluded. If reinstated, the Solterra would win by roughly $10,125.
- Cold-weather range concerns. Rachel routinely drives to trailheads at 8,000–10,000 feet elevation. Real-world Solterra range in cold weather at altitude with occasional heavy load (photography gear, sometimes a bike or kayak) may be 25–35% below EPA rating — meaning weekly range planning during winter. This isn't a cost impact but a lifestyle friction the Forester avoids entirely.
- Comparing to Toyota RAV4 Hybrid. Against a 39-MPG RAV4 Hybrid, the fuel gap closes significantly. The Solterra would still win in Colorado thanks to the state credit, but by roughly $500 rather than $2,625.
Run these numbers with your details
Different Colorado ZIP, different mileage, or considering the Solterra Limited trim? The math shifts with those choices. Try the calculator with Rachel's vehicles pre-loaded, then adjust for your situation.
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