# Semi Truck Cost Per Mile Calculator: South Dakota (SD)

Source: https://truxx.ai/tools/cost-per-mile-calculator/semi/south-dakota

> A semi / dry van costs about $1.91 per mile to operate in South Dakota in 2026, based on local diesel at $3.30/gallon and average commercial insurance of $456/month (national range $1.75–$2.45/mi). State-specific factors below.

## South Dakota-specific costs

Diesel fuel in South Dakota currently averages $3.30 per gallon, which includes a state fuel tax of 28.0¢ per gallon. This fuel tax is near the national average and should be factored into your semi / dry van rate calculations.

Average commercial semi / dry van insurance in South Dakota runs approximately $456/month. This moderate premium is typical for the region and should be reviewed annually to ensure you're not overpaying.

Semi trucks average 5.5–7.5 MPG, making fuel the largest single expense — typically 30–40% of total CPM. At these consumption rates, even a $0.20/gallon price difference between states changes your CPM by $0.03–$0.04/mile, which compounds to $300–$450/month at 11,500 miles.

South Dakota has no state income tax, benefiting owner-operators. The state's agricultural economy generates seasonal grain and livestock hauling demand. I-90 carries east-west freight, but load options thin out in rural areas.

Semi insurance premiums are the highest of any equipment class, reflecting the higher liability exposure and cargo values. Tire costs ($0.04–$0.06/mile), DEF fluid, and DPF maintenance add meaningful variable costs that lighter equipment classes don't face.

## South Dakota Semi / Dry Van FAQs

**How much does it cost to operate a semi in South Dakota?**

A semi costs about $1.91 per mile to operate in South Dakota in 2026, based on local diesel at $3.30/gallon and average commercial insurance near $456/month. Fuel alone runs about $0.49/mile at 6.8 mpg. Your actual cost per mile depends on utilization, financing, and how much you deadhead.

**What is the diesel fuel tax in South Dakota?**

South Dakota charges 28.0¢ per gallon in state diesel tax — near the national average. At 6.8 mpg, that tax alone adds roughly $0.041 per mile on top of the base fuel price.

**How much is commercial semi insurance in South Dakota?**

Commercial semi insurance in South Dakota averages about $456/month ($5,472/year). That is typical for the region; review it annually to make sure you are not overpaying.

## Nearby state pages

- [Semi / Dry Van CPM in North Dakota](https://truxx.ai/tools/cost-per-mile-calculator/semi/north-dakota)
- [Semi / Dry Van CPM in Minnesota](https://truxx.ai/tools/cost-per-mile-calculator/semi/minnesota)
- [Semi / Dry Van CPM in Iowa](https://truxx.ai/tools/cost-per-mile-calculator/semi/iowa)
- [Semi / Dry Van CPM in Nebraska](https://truxx.ai/tools/cost-per-mile-calculator/semi/nebraska)
- [Semi / Dry Van CPM in Wyoming](https://truxx.ai/tools/cost-per-mile-calculator/semi/wyoming)

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## Semi / Dry Van cost breakdown (national)

Source: https://truxx.ai/tools/cost-per-mile-calculator/semi

> Semi truck operating cost per mile averages $1.75–$2.45 in 2026 for owner-operators running dry van or reefer freight. The American Transportation Research Institute (ATRI) pegs marginal cost at roughly $2.27/mile across the trucking industry. That splits into about $0.85–$1.20/mile in variable costs (fuel at 6.5–7 mpg, maintenance, tires) and $0.90–$1.25/mile in fixed costs (truck payment, insurance, ELD, permits) at 11,500 monthly miles.

## At a glance

| Metric | Value |
| --- | --- |
| Total operating CPM | $1.75–$2.45/mi |
| Variable costs | $0.85–$1.20/mi |
| Fixed costs | $0.90–$1.25/mi |
| Typical monthly miles | 11,500 |
| Typical fuel efficiency | 6.8 mpg |
| Typical fuel price | $4.05/gal |
| GVWR range | 26,001 - 80,000 lbs |

## Variable costs ($0.85–$1.20/mi)

- **Fuel** — $0.55–$0.75/mi. Based on 6.5–7 mpg and $3.85–$4.50/gal diesel.
- **Maintenance & tires** — $0.25–$0.40/mi. Ten or eighteen tires depending on configuration; major service every 25–50k miles.
- **Tolls, scales, parking** — $0.05–$0.10/mi. Truck-specific tolls run higher than 4-wheel vehicles on most networks.

## Fixed costs ($0.90–$1.25/mi)

- **Insurance** — $1,100–$1,700/mo. Primary liability ($750k–$1M), cargo, physical damage. Higher with hazmat.
- **Truck & trailer payment** — $2,200–$3,500/mo. New Class 8 tractor + dry van trailer financed over 60–72 months.
- **ELD, IFTA, permits, factoring** — $300–$600/mo. ELD subscription, IFTA filing, UCR, MC authority, optional factoring fees.

## How to calculate your semi truck cost per mile

1. **Add up monthly fixed costs.** Sum truck and trailer payments, insurance, ELD, IFTA, MC authority, parking, and accountant or factoring fees.
2. **Calculate variable cost per mile.** Fuel cost per mile = diesel price ÷ MPG (typically 6.5–7 mpg). Add maintenance ($0.25–$0.40/mi) and tolls ($0.05–$0.10/mi).
3. **Divide fixed costs by miles driven.** Total monthly fixed cost ÷ monthly miles. At 11,500 miles/month, expect $0.90–$1.25 in fixed cost per mile.
4. **Add variable + fixed for operating CPM.** Operating CPM = variable + fixed. Add desired weekly take-home divided by weekly miles to get your minimum acceptable rate per mile.

## Frequently asked questions

### What is the average cost per mile for a semi truck?

Semi truck operating cost per mile averages $1.75–$2.45 in 2026, with the American Transportation Research Institute pegging the industry marginal cost at roughly $2.27/mile. Variable costs run $0.85–$1.20/mile and fixed costs $0.90–$1.25/mile at 11,500 monthly miles.

### What is a good break-even rate for semi truck loads?

Most owner-operators need a minimum all-in rate of $2.25–$2.75/mile to cover operating cost plus a livable take-home. Long-haul OTR drivers typically target $2.50/mile or higher on the spot market.

### What is the biggest expense for a semi truck owner-operator?

Fuel is the single largest variable expense at $0.55–$0.75/mile. Truck payment plus insurance is the largest fixed expense, often exceeding $3,500/month combined. ATRI reports fuel and driver pay together account for roughly 60% of marginal cost.

### How do I lower my semi truck cost per mile?

Three highest-impact moves: (1) keep deadhead under 10% with disciplined dispatch, (2) drive 11,500+ monthly miles to spread fixed cost across more revenue, (3) maintain 6.8+ mpg through cruise control discipline, aerodynamic upgrades, and tire pressure monitoring.

### How does semi truck CPM compare to a box truck?

Semis run $1.75–$2.45/mile vs $1.35–$1.90 for a 26 ft box truck. Semis cost more per mile but earn meaningfully more revenue per mile because they haul ~3× the freight volume per load.

## Related calculators

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- [Box Truck CPM](https://truxx.ai/tools/cost-per-mile-calculator/box-truck)
- [Semi Truck CPM](https://truxx.ai/tools/cost-per-mile-calculator/semi)
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This page is published by Truxx.AI, an AI-powered trucking dispatch platform. Free interactive calculator at https://truxx.ai/tools/cost-per-mile-calculator/semi.