RV Cost Calculator

RV Fuel Efficiency: Save 30% on Gas

Based on 50,000+ miles of real-world RV travel data and proven techniques

Updated: April 15, 2025 8 min read

After putting over 50,000 miles on three different RVs across 38 states, I've transformed from an inefficient driver burning through fuel to someone who can squeeze 30% more miles from every gallon. When I first started, I averaged a dismal 7 MPG. Now, I consistently get 9-10 MPG with the same vehicle. Here's exactly how I did it, with calculators to show your potential savings.

The Scientific Speed Sweet Spot

Through methodical testing and data collection, I discovered that driving at 62-65 mph is the optimal speed for most RVs. Wind resistance increases exponentially with speed, and every 5 mph over 65 can reduce fuel economy by approximately 5%.

Real Example

On my 1,200-mile trip from Arizona to Colorado last summer, maintaining 62 mph instead of my previous 70 mph saved me precisely $137 in fuel costs while only adding 1.5 hours to my total drive time.

Maintenance: Measured Improvements

I've tracked the precise MPG impact of each maintenance factor. Here's what actually moves the needle:

+0.6 MPG

Proper Tire Pressure

Check weekly. Use cold inflation pressure.

+0.3 MPG

Clean Air Filters

Inspect monthly, replace as needed.

+1.0 MPG

Regular Engine Tune-up

Every 10,000 miles for best results.

Weight Reduction Tactics

Engineering principles confirm that every 100 pounds you remove from your RV can improve fuel efficiency by approximately 2%. Here are specific actions that made the biggest difference:

  • Only fill water tanks when necessary (can save 400+ lbs)
  • Remove unused equipment and accessories (I found 165 lbs of items I rarely used)
  • Switch to lightweight alternatives for dishes, tools, and furniture
  • Quarterly decluttering sessions (prevents accumulation)

Calculate Your Exact Savings

RV Trip Fuel Cost Calculator

Current Cost: $500.00
Cost with Improvements: $388.89
Your Savings: $111.11

Weight Reduction Impact Calculator

See how much you can save by reducing weight in your RV.

MPG Improvement: 2.00%
New Estimated MPG: 7.14
Estimated Savings (this trip): $9.80

Speed Impact Calculator

Calculate how much your driving speed affects fuel economy.

Current MPG Loss Due to Speed: 5.00%
Potential MPG at Optimal Speed: 7.37
Estimated Savings (this trip): $25.00

Get Our Complete RV Cost Guide

Join 15,000+ RV owners receiving our weekly tips and get our 32-page fuel savings guide free.

Frequently Asked Questions

Does RV size really affect fuel efficiency that much?

Absolutely. Class A motorhomes typically get 7-13 MPG, Class C vehicles average 10-15 MPG, while Class B campervans can achieve 18-25 MPG. Weight and aerodynamics are the primary factors.

How often should I change my RV's oil for optimal efficiency?

For diesel engines, every 5,000-7,000 miles is recommended. For gas engines, every 3,000-5,000 miles. Always use the manufacturer-recommended oil weight for best efficiency.

Are fuel additives worth it for improving RV gas mileage?

In my testing, quality fuel additives showed a modest 1-3% improvement in fuel economy. However, they're most beneficial for older engines or when using lower-quality fuel.

What's the biggest mistake RV owners make regarding fuel efficiency?

Neglecting tire pressure is the most common mistake. Under-inflated tires by just 10% can reduce fuel economy by 3.3%. I recommend checking pressure before every travel day.

Mike Johnson

Full-time RVer since 2019 with over 50,000 miles across 38 states. Former mechanical engineer specializing in vehicle efficiency.

Related RV Calculators

Complete collection of RV planning tools

Need a custom calculator for your specific RV needs?

Request Custom Calculator