You’re standing in downtown Indianapolis, the morning sun hitting the glass of the Salesforce Tower, and you’ve got a choice to make. You need to get to St. Louis. It’s a 242-mile stretch of I-70 that most people describe as "flat" or "monotonous." But today, it’s different. You aren't climbing into a vibrating, gas-chugging rental from a generic airport lot. Instead, you’re sliding into a Tesla Model 3 from Frontier Tesla. The door thucks shut with a reassuring density. The cabin is silent.
But as you look at the navigation screen, a question probably pops into your head. It’s the same one we hear from almost every first-time EV renter: "How much is this actually going to cost me in 'fuel'?"
We’ve spent years managing a fleet of self-driving-capable electric cars, and we’ve seen the data from thousands of trips across the Midwest. The Indianapolis-to-St. Louis run is one of our most popular routes. Here’s the reality of the Tesla Model 3 charging cost road trip, broken down by the cent, the kilowatt, and the mile.
Fuel Savings: Does a Tesla Rental Actually Beat the Pump?
Let’s tackle the big one first. Will you save money on fuel by renting a Tesla for your St. Louis trip? The short answer is a resounding yes. But I’m not just going to tell you that; I’m going to prove it with the kind of math that makes sense when you’re staring at a gas station sign in Terre Haute.
According to 2024 data from AAA, the average price of regular gasoline in the Midwest hovers around $3.35 per gallon. If you were driving a standard mid-size rental car—think a Chevy Malibu or a Nissan Altima—you’d likely average about 30 miles per gallon on the highway. For a round trip of roughly 485 miles, you’d burn about 16 gallons of gas. That’s a total fuel bill of approximately $53.60.
Now, let’s look at the Model 3. On this specific route, the car is incredibly efficient. We’ve found that our renters typically achieve an efficiency of about 260 Wh/mi (watt-hours per mile). Over 485 miles, you’re looking at using roughly 126 kWh of electricity. Even at higher-tier Supercharger rates, your total cost will likely land between $38 and $44.
You aren't just saving ten or fifteen bucks. You’re opting out of the volatile oil market. You’re avoiding the greasy handles and the "convenience store tax" of the traditional gas station. In a Tesla, the savings are baked into the architecture of the car.
Mapping the Miles: Where You’ll Plug In Between Indy and STL
I-70 is an "Alternative Fuel Corridor," a fancy designation that basically means you’re never far from a high-speed charger. For the Indy-to-STL run, you have two primary strategic stops.
The Terre Haute Stop: Your First Charge
About 75 miles into your journey, you’ll hit Terre Haute. Located just off the highway at the Haute City Center, this Supercharger station is a classic. It’s a V2 station, meaning it delivers up to 150 kW.
Here’s a pro tip we give all our Frontier Tesla clients: You don’t need to "fill up" here. In an EV, you want to charge when the battery is low and the charging speed is highest. If you left Indy with an 80% charge, you’ll likely still be at 50% in Terre Haute. Unless you need a bathroom break or a snack from the nearby Starbucks, keep driving. The goal is to arrive at your next stop with a "warm" battery and a lower state of charge to maximize your speed.
Effingham: The Mid-Point Milestone
Effingham, Illinois, is the sweet spot. It’s roughly 145 miles from Indianapolis. By the time you pull into the Supercharger located near the Meijer or the Flying J, your battery will likely be around 20-30%. This is where the Model 3 shines.
Because the battery is lower, the car can pull power at its maximum rate. You’ll see the miles-per-hour of charge climb rapidly. Usually, a 15-minute stop here is enough to get you all the way into downtown St. Louis with plenty of juice to spare for driving around the Delmar Loop or heading to a Cardinals game at Busch Stadium.
Calculating the Total: What You’ll Spend on Supercharging
How much will I spend on Supercharging for a round trip to St. Louis? This is the question that keeps people up at night before their first trip. Let’s get granular.
Tesla Superchargers generally bill by the kilowatt-hour (kWh), though some older stations in certain states still bill by the minute. In the Illinois and Missouri corridor, you’re looking at kWh billing. Rates typically range from $0.32 to $0.48 per kWh, depending on the time of day.
The Round Trip Breakdown:
- Total Distance: 485 miles.
- Energy Used: ~125 kWh.
- Average Cost: $0.36 per kWh.
- Total Estimated Cost: $45.00.
Compare that to the $55+ you’d spend on gas. But here’s the thing I’ve noticed: people often forget about the "destination charging." Many hotels in St. Louis, like the Chase Park Plaza or the various Hiltons downtown, offer free Level 2 charging for guests. If you plug in overnight at your hotel, your "fuel" cost for the return leg could drop to zero. We’ve had renters complete the entire round trip for under $25 because they were strategic about where they slept.
Understanding Tesla Supercharger Pricing Tiers
Tesla recently moved toward "Time of Use" pricing at many of its busiest stations. This means if you’re charging at 2:00 PM on a Friday, you might pay a premium. If you’re a night owl or an early riser charging before 8:00 AM or after 8:00 PM, the rates can drop significantly—sometimes as low as $0.20 per kWh.
What we've learned is that most travelers don't want to schedule their lives around a charging bill. That’s fine. Even at peak rates, you’re still coming out ahead. The car’s navigation system is brilliant; it will tell you exactly what the rate is at each station before you even arrive. No surprises. No hidden fees. Just transparent data on a 15-inch screen.
Factors That Influence Your Road Trip Efficiency
Not every trip is created equal. I’ve seen two different drivers take the same Model 3 from Indy to STL and come back with two different energy reports. Why?
- The Speed Factor: I-70 has a 70 mph speed limit once you clear the Indy suburbs. If you’re doing 80 mph, your energy consumption will spike. Aerodynamic drag increases with the square of your speed. Dropping from 80 to 72 mph can sometimes save you 15% in energy.
- The Weather: The Midwest is famous for its "four seasons in one day" vibe. If you’re driving into a 20 mph headwind coming off the plains of Illinois, your efficiency will drop. Similarly, running the heater in 20-degree weather uses more juice than the AC in 90-degree weather.
- Tire Pressure: We keep our Frontier Tesla fleet at the optimal PSI, but it’s worth noting. Low tires equal high friction.
Returning the Rental: How Do You Pay for the Power?
This is the part that confuses people used to the "bring it back full or we charge you $9 a gallon" policy of traditional rental agencies. How do I pay for charging when I return the rental Tesla?
At Frontier Tesla, we’ve made this as seamless as possible. When you use a Tesla Supercharger, the car "talks" to the station. The station knows the car’s VIN, and it bills our corporate account instantly. You don’t need to swipe a credit card or download an app at the charging stall. You just plug in, the light turns green, and you go get your coffee.
When you return the car to us in Indianapolis, we receive an itemized list of every charging session from Tesla. We simply pass that cost through to you. There’s no markup. There’s no "convenience fee." If Tesla charged us $12.42 for your stop in Effingham, that’s exactly what you’ll see on your final invoice.
It’s actually much easier than a gas car. You don’t have to hunt for a gas station within three miles of the drop-off point while you’re rushing to catch a flight or get home. Just bring it back with at least 30 miles of range, and we handle the rest.
Beyond the Dollars: Why the Model 3 Wins the Road Trip
If we’re only talking about the Tesla Model 3 charging cost road trip, we’re missing the point. The reason you rent a Tesla isn't just to save ten dollars on fuel. It’s for the experience.
Imagine hitting the Illinois border. You engage Autopilot (or Full Self-Driving, if your rental is equipped). The car maintains its lane, adjusts its speed for traffic, and handles the gentle curves of the highway. You’re still supervising, but the "micro-stress" of driving—the constant tiny corrections to the steering wheel—disappears. You arrive in St. Louis feeling refreshed, not drained.
Then there’s the storage. With no engine, you have a "frunk" (front trunk). It’s the perfect spot for a cooler or your charging cables. The main trunk is deep and spacious. For a weekend trip for two, or even a small family, it’s more than enough room.
Key Takeaways for Your St. Louis Adventure
If you’re skimming this while packing your bags, here are the "must-know" points:
- Expect to spend $40-$50 on total charging for a round trip if you don't have free hotel charging.
- Gas is roughly 25-30% more expensive than Supercharging on this specific route.
- Stop in Effingham. It’s the most efficient place to charge based on the distance from Indy.
- Don't worry about payment. It’s billed to the car and handled through your Frontier Tesla final invoice.
- Use the Nav. Always put your destination into the Tesla’s navigation. It will manage your battery and tell you exactly where to stop.
Frequently Asked Questions
Q: What happens if I run out of battery on I-70? A: Honestly? It’s almost impossible. The car will warn you repeatedly if you’re driving too fast to reach your next stop. It will suggest a closer charger or tell you to slow down. In the rare event of a total discharge, Tesla provides roadside assistance, but with 250+ miles of range and chargers every 50 miles, you’d have to try pretty hard to get stranded.
Q: Is Supercharging bad for the battery? A: For a road trip? Not at all. These batteries are designed to handle high-speed charging. Since you’re renting from us, you get the benefit of a well-maintained, latest-generation battery without any of the long-term ownership concerns.
Q: Can I use non-Tesla chargers? A: You can, but why would you? The Supercharger network is the "gold standard." It’s more reliable, faster, and easier to use than third-party networks. However, if you find a "Destination Charger" at a restaurant or museum, feel free to plug in!
The Frontier Tesla Difference
We started Frontier Tesla because we were tired of the "beige" experience of renting cars. We wanted to give people a glimpse into the future of transport. When you book with us, you aren't just getting a car; you’re getting a concierge experience. We’ll walk you through the charging process, help you set up your driver profile, and make sure you’re comfortable with the tech before you pull out of the lot.
Ready to see how much you can save—and how much fun you can have—on your next trip to the Gateway City?
Book your Tesla Model 3 for your St. Louis trip here.
Sources
- AAA Gas Prices - Missouri and Indiana Averages (2024) - Data on regional fuel costs.
- EPA Fuel Economy Guide (2024) - Comparison data for Model 3 efficiency vs. ICE vehicles.
- Tesla Supercharger Map and Pricing Structure - Official network data and billing policies.
- U.S. Department of Energy - Alternative Fueling Station Locator - Verification of I-70 charging corridor density.