According to the IRS, the 2026 business standard mileage rate is 72.5 cents per mile, a widely used proxy for “all‑in” driving cost that reflects fuel, maintenance, depreciation, and other ownership costs. AAA’s “Your Driving Costs” study similarly shows that total per‑mile costs vary by vehicle type, with hybrids and SUVs landing in different cost bands depending on depreciation, fuel, insurance, and maintenance assumptions. And fuel itself can move quickly: EIA and FRED’s weekly U.S. regular-gasoline series shows the national average shifting from $3.015/gal (week ending March 2, 2026) to $3.502/gal (week ending March 9, 2026). Put those together and the decision becomes practical: for a 1,000‑mile weekend, when does it make more sense to rent a newer SUV instead of driving an older one?
Quick takeaways
- The clean way to compare is two formulas: own-car trip cost (fuel + wear) versus rental trip cost (rate + taxes/fees + insurance choice + fuel).
- For a 1,000‑mile trip, fuel is rarely the whole story. A per‑mile wear proxy (IRS or AAA-style) often dominates the “true” cost of driving an older SUV.
- Rental add-ons are where people lose money: the FTC warns rental counters often sell optional waivers/coverage (CDW/LDW) and the right choice can depend on personal auto insurance and credit-card benefits.
- Use two gas-price scenarios because the weekly series can move between booking day and departure day (EIA/FRED).
- Best decision rule: rent when reliability risk or comfort needs are high, or when the “all‑in per‑mile” cost of your own vehicle is close to the rental’s daily price math.
Step 1: Define the two cost buckets (no guessing)
A 1,000‑mile trip cost comparison is easiest when separated into two buckets.
Bucket A — Driving your own SUV
Own cost = Fuel + Wear
- Fuel is the obvious part.
- Wear is the part most people ignore: tires, oil, maintenance, and depreciation (value lost from adding miles).
Two ways to estimate wear without inventing numbers:
- All‑in proxy (simple): use the IRS 2026 mileage rate (72.5¢/mile) as a “budgeting lens.”
- Category-based proxy (more nuanced): use AAA’s per‑mile category costs to understand where your vehicle likely sits (small sedan vs SUV vs hybrid, etc.).
Bucket B — Renting an SUV
Rental cost = Base rate + Taxes/fees + Insurance choice + Fuel
Rental bills usually expand through:
- taxes and facility fees,
- optional products (damage waiver, supplemental liability, roadside),
- extra-driver or young-driver fees,
- and fuel policy mistakes.
The goal is not to eliminate all fees. The goal is to make them visible before committing.
Step 2: The formulas (paste these into Notes)
Use these exact lines and the math stays clean.
Own-SUV formula
1) Fuel cost = (Miles ÷ MPG) × Gas price
2) Wear cost = Miles × Wear-per-mile
3) Own total = Fuel cost + Wear cost
Rental formula
1) Base rental = Daily rate × Days
2) Fees/taxes = (Percent or flat fees, depending on market)
3) Insurance choice = (0 if covered/declined) OR (daily coverage × days)
4) Fuel cost = (Miles ÷ MPG) × Gas price
5) Rental total = Base rental + Fees/taxes + Insurance choice + Fuel cost
Step 3: A 1,000‑mile example (with conservative assumptions)
This example is a template, not a promise. Swap in your numbers.
Example assumptions
- Trip distance: 1,000 miles
- Your SUV’s real MPG on highway: 20 mpg (example only)
- Rental SUV MPG: 28 mpg (example only)
- Gas price scenarios from EIA/FRED weekly series: $3.015/gal and $3.502/gal
- Wear-per-mile options:
- IRS lens: 0.725 $/mile
- AAA lens: use AAA’s category per‑mile totals to choose a more appropriate figure for your class of vehicle
Fuel math
- Own SUV fuel (20 mpg): 1,000 ÷ 20 = 50 gallons
- Rental fuel (28 mpg): 1,000 ÷ 28 = 35.7 gallons
At $3.015/gal:
- Own fuel ≈ $150.75
- Rental fuel ≈ $107.68
At $3.502/gal:
- Own fuel ≈ $175.10
- Rental fuel ≈ $125.07
Wear math (two ways)
- IRS lens: 1,000 × $0.725 = $725 “all‑in” driving cost proxy (this includes fuel in the IRS concept, so don’t double-count it if you use IRS as your all‑in total).
- Fuel + wear split approach: choose a wear-per-mile that excludes fuel (if you have one), then add fuel separately.
The takeaway from this structure: fuel differences are often tens of dollars, while wear/ownership cost can be hundreds—especially for older, less efficient SUVs.
Step 4: The break-even rule (the decision in one line)
If you want a simple “rent or drive” trigger, use this:
Rent makes sense when:
(Daily rate × Days + Fees + Insurance choice) < (Miles × Wear-per-mile) + Reliability/comfort value
Because wear-per-mile can be hard to pick, use a range:
- Low wear case: your vehicle is newer, efficient, and depreciation is lower per mile.
- High wear case: your vehicle is older, thirsty, needs tires/brakes soon, or is near a major service interval.
If rent is cheaper in the high wear case, renting usually makes sense.
Step 5: The hidden line items that flip the rental decision
Renting can look cheap until add-ons appear.
Optional damage waivers and coverage
The FTC notes rental companies may sell a Collision Damage Waiver / Loss Damage Waiver (CDW/LDW) and that credit cards may offer CDW coverage when used to pay—often requiring that the renter decline the rental company’s coverage to be eligible.
Practical implication:
- Check whether personal auto insurance and credit card benefits cover rentals and under what conditions.
- If unsure, treat CDW as a real line item and price it in.
A government consumer guide (archived in a govinfo PDF) also lists typical CDW daily charges in some states as a per‑day optional cost, reinforcing why add-ons can dominate a 2–3 day weekend bill.
Fees you should ask about before booking
- Facility/concession fees at airports
- Additional driver fee
- Underage driver fee (if applicable)
- Toll programs and administrative charges
- Fuel policy (prepay vs return full)
What this means in the U.S.
For a 1,000‑mile weekend in the U.S., the decision often comes down to:
- reliability risk (older SUV on long miles),
- comfort (noise, seats, driver-assist),
- fuel efficiency (meaningful but not usually decisive),
- and rental add-ons (the biggest source of surprise).
In toll-heavy regions or airport pick-ups, fees rise quickly. In rural routes, reliability and comfort matter more than rate shopping.
What you can do (a 12-minute decision checklist)
1) Price your own fuel: miles ÷ real MPG × gas price.
2) Pick a wear proxy: IRS 72.5¢/mile (all-in lens) or AAA category cost (more tailored).
3) Get one rental quote: daily rate × days, then ask about taxes/fees.
4) Decide coverage: confirm what personal insurance/credit card covers; price CDW if unsure.
5) Add reliability value: if a breakdown would ruin the trip, renting buys insurance in a non-financial sense.
6) Run the break-even line: if rent is close, choose the option that reduces stress.
Bottom line
A 1,000‑mile trip is long enough that wear and reliability often matter as much as fuel.
If your own SUV is newer, efficient, and up-to-date on maintenance, driving it can be the simplest option—especially if the rental quote is inflated by add-ons and airport fees. If your SUV is older, thirsty, or near a major maintenance interval, renting can make more sense because it shifts wear, breakdown risk, and sometimes comfort burden to the rental.
The easiest way to decide is to plug your numbers into the two formulas above and compare in ranges, not a single “perfect” total.