Your truck gets a solid 18 mpg cruising down the highway… until you hook up the camper. Suddenly, you’re seeing 10-12 mpg and watching the fuel gauge drop like a rock.
Here’s the straight answer: towing typically drops your MPG anywhere from 20% to 50%, depending on what you’re hauling, how fast you’re going, the terrain, and how you drive. The two biggest culprits are weight and aerodynamic drag. Your engine works harder to move all that extra mass, while pushing a big trailer through the air creates massive resistance.
We’ll break down the MPG loss you can expect, explain why towing kills fuel economy, and share practical ways to reduce the hit and plan your fuel costs better.
Why Towing Lowers Your Fuel Economy
Does towing consume more fuel? For sure it does, and there are two main reasons why.
First, extra weight forces your engine to burn more fuel when accelerating and climbing hills. Every 100 lbs typically reduces fuel economy by roughly 1-2%. A 5,000-lb camper plus gear adds up fast.
Second, aerodynamic drag creates a bigger “wall” to push through the air. The boxier and taller your trailer, the worse this gets. Air resistance increases exponentially with speed, so at 60-70 mph with a tall trailer, your engine works overtime just to maintain speed. This is why highway MPG often takes the biggest dive when towing.
Your vehicle’s factory MPG ratings assume light cargo and no trailer, so towing is always “off-spec” compared to that window sticker.
How Much MPG Drop to Expect When Towing
Let’s talk real numbers. The exact MPG drop varies, but here are typical ranges:
Light utility trailer or small cargo (1,000-2,000 lbs, low profile): Maybe 10-20% MPG drop at moderate speeds. A truck getting 18 mpg might see 14-16 mpg.
Mid-size camper or boat (3,000-5,000 lbs, more frontal area): Expect 20-40% drop. That 18-mpg truck falls to around 10-13 mpg.
Heavy camper or enclosed trailer (6,000+ lbs, big frontal area): Commonly 30-50% MPG drop, sometimes more at high speeds or in hills. Your 18 mpg truck might deliver only 9-11 mpg.
Put another way: a 600-mile trip needs 33 gallons at 18 mpg, but 55-60 gallons at 10 mpg. That’s the reality of towing.
Smaller engines and lighter-duty vehicles often see bigger percentage drops than heavy-duty trucks designed for towing.
Factors That Make Your MPG Drop More (or Less)
Not all towing hits fuel economy equally. Here’s what makes the difference:
Total Weight (Vehicle + Trailer + Cargo)
Heavier means more fuel per mile. Don’t forget tongue weight and gear in your truck bed – it all counts against you.
Speed
Above 50-60 mph, aerodynamic drag ramps up fast. The jump from 60 mph to 75 mph dramatically worsens towing MPG. Does tow haul use more gas at high speeds? The mode itself helps manage shifts, but wind resistance is the real killer.
Trailer Shape (Aerodynamics)
Tall, boxy campers create way more drag than low-profile boats or flatbeds. Roof racks and bikes on top add noticeable drag too. How much does weight affect gas mileage compared to aerodynamics? At highway speeds, aerodynamics often matters more.
Terrain & Traffic
Hills force your engine to work much harder. Stop-and-go traffic means repeatedly burning fuel to accelerate all that weight from stops. Long, flat stretches at steady speeds are your friend.
Engine Type & Size
Diesels typically get better fuel economy under load and lose a smaller percentage when towing. Bigger, torquier engines working comfortably beat small engines maxed out.
Drivetrain & Gearing
4WD versus 2WD, axle ratios, and transmission behavior all affect MPG. Does tow mode use more gas? It changes shift patterns to protect your transmission, slightly lower peak MPG, but prevents gear hunting that wastes more fuel.
Trailer & Load Setup: Small Changes, Real MPG Gains
Small adjustments to your trailer and loading can claw back meaningful fuel economy.
Choose lighter trailers: Aluminium weighs less than steel. Minimalist builds save several hundred pounds. Every 100 lbs saved equals roughly 1-2% better MPG.
Keep it streamlined: Avoid unnecessary height. Remove roof racks, cargo boxes, and bike racks when not using them, even empty, as they create drag.
Load placement matters: Proper tongue weight prevents sway that forces corrections and wastes fuel. Secure items so nothing shifts during transit.
Leave what you don’t need: Unused gear, extra water, tools—it adds up fast. Every 100 lbs left behind buys back about 1-2% fuel economy.
Driving Habits That Help Fuel Economy While Towing
How you drive makes a real difference in fuel costs.
Keep speeds reasonable: The 55-65 mph range is often the sweet spot for towing MPG. Above 75 mph, wind resistance kills economy. Use cruise control on flat highways, but avoid it on steep hills.
Accelerate and brake smoothly: Gentle throttle and anticipating slowdowns prevent wasting fuel on repeated hard acceleration. Avoid “sprint then coast” driving.
Plan your route: Routes with less stop-and-go, fewer steep climbs, and steady speeds save fuel. Sometimes a longer route on flat terrain beats a shorter hilly one.
Avoid unnecessary idling: Shut down during longer stops. Modern engines don’t need a warm-up, and the fuel savings add up.
Use tow mode smartly: It protects your transmission and prevents gear hunting. Slightly lower peak MPG beats excessive shifting that wastes more fuel long-term.
Vehicle & Trailer Maintenance That Protects MPG
Basic maintenance pays off in better fuel economy and fewer breakdowns.
Tire pressure: Underinflated tires (vehicle or trailer) increase rolling resistance. Being 20% low can increase fuel use and overheat tires. Check pressure before every trip, and if you’re running a lifted truck, proper tire pressure becomes even more critical for towing safely.
Wheel bearings & brakes: Dragging trailer brakes or dry bearings creates extra resistance. Properly greased bearings and adjusted brakes let your trailer roll freely.
Alignment: Misalignment causes tire scrubbing and higher rolling resistance. If your vehicle pulls to one side, get it checked.
Engine health: Clean air filter, correct oil grade, and well-maintained transmission and cooling system all help efficiency under heavy loads.
Bottom line: if it makes your rig harder to roll, it’s costing you fuel. Maintenance reclaims MPG and prevents breakdowns.
Estimating Fuel Cost When Towing
Planning ahead helps you budget for fuel and schedule stops.
Simple estimation method:
- Start with your vehicle’s real-world highway MPG (not window sticker)
- Estimate towing MPG drop: light trailer ~20%, medium ~30-35%, heavy ~40-50%
- Calculate fuel needed: trip distance ÷ towing MPG = gallons
- Multiply by the local fuel price for the trip cost
Example: Your truck gets 18 mpg normally. Towing a heavy camper drops it 40% to about 11 mpg. A 600-mile trip needs roughly 55 gallons. At $3.50/gallon, that’s $192 versus $115 without towing, an extra $77.
Keep notes on actual towing MPG after trips. Real-world data beats estimates and helps you plan better next time.
The Bottom Line: Towing Costs More, But You’re Not Helpless
Look, let’s be real, towing is going to hit your wallet at the pump. That 20-50% MPG drop isn’t going away, and there’s no magic trick to make a 6,000-lb camper disappear into thin air. Weight is weight, drag is drag, and physics doesn’t negotiate.
But you know now that every 100 lbs you ditch saves you 1-2% on fuel. You know that backing off from 75 mph to 60 mph can make a real difference. You know that underinflated tires and dragging brakes are stealing money from your pocket on every mile.
So before your next trip, take 20 minutes. Check your tire pressure. Toss out the gear you’re not using. Plan a route that doesn’t involve climbing every mountain between here and there.
Ready to make sure your truck is up to the challenge?
Check out our lift shop for towing-ready modifications, or browse our full inventory of lifted trucks that can handle whatever you need to haul.
