Motorhome Fuel Costs: How Much Will I Spend on Diesel?

The question we get asked more than almost any other at Heath's is: how much will I spend on fuel? It is a fair question. Motorhomes are bigger and heavier than cars, and if your reference point is a Volkswagen Golf doing 50 miles per gallon, the motorhome fuel costs can feel daunting. But the reality is more reassuring than most people expect, and when you factor in the savings on accommodation and eating out, a motorhome trip is often cheaper than the alternative.

Here are the real numbers, based on the vehicles in our fleet and the trips our customers actually take.

What Does a Motorhome Actually Do to the Gallon?

Modern motorhomes - the kind we hire from our Pontefract depot - run on diesel and typically achieve between 25 and 30 motorhome miles per gallon. That is significantly less than a modern diesel car (which might manage 45-55 MPG), but considerably better than older motorhomes or larger American-style RVs. The exact figure depends on several factors: driving style, road type, payload weight, wind conditions, and terrain.

Motorway cruising at a steady 60 mph tends to produce the best economy - around 28-30 MPG. Urban driving with frequent stops drops that to 22-25 MPG. Hilly terrain - the Lake District, Scotland, Wales - sits somewhere in between. As a realistic planning figure for a mixed journey, 27 MPG is a sensible number to use for our vehicles. Conservative enough to avoid unpleasant surprises, close enough to reality to be useful.

How Much Will Common Trips Cost?

Let us work through some real examples using current diesel prices. At the time of writing, diesel is approximately 1.45 per litre at supermarket pumps, which equates to roughly 6.60 per gallon. (Motorway services charge more - 1.60 to 1.70 per litre is common - which is why filling up at supermarkets before and during your trip is always the smarter move.)

Yorkshire Dales weekend - Pontefract to Hawes and back, with some driving around the Dales: roughly 150 miles total. At 27 MPG, that is 5.5 gallons, costing about 36 in diesel. Less than the price of a takeaway for two.

Lake District week - Pontefract to Windermere, then touring around Keswick, Coniston, Ambleside, and back (see our Lake District motorhome guide for route ideas): roughly 350-400 miles. At 27 MPG, that is about 14 gallons, costing approximately 92. For a week's holiday transport, that is remarkably affordable.

North Coast 500 (Scotland) - Pontefract to Inverness, the NC500 loop, and home: roughly 1,100-1,200 miles total. At 27 MPG, that is about 43 gallons, costing approximately 284. This is the big one, but spread over 10-14 days, it works out at 20-28 per day for fuel.

Cornwall - Pontefract to Cornwall and back is about 650 miles each way, plus local driving: roughly 1,400-1,500 miles total. At 27 MPG, that is about 54 gallons, costing approximately 356. The distance is significant, but again, spread over a week or two, it is manageable.

A weekend break to the Yorkshire coast - Pontefract to Whitby and back with coastal driving: roughly 180 miles. At 27 MPG, that is about 7 gallons, costing around 46.

Putting It in Context

Those motorhome fuel costs look very different when you compare them to the costs of an equivalent holiday without a motorhome. A week in the Lake District in a hotel or Airbnb costs 700-1,500 for accommodation alone. A motorhome campsite pitch costs 20-35 per night. Even adding fuel costs, the motorhome trip is dramatically cheaper.

The real savings multiply on longer trips. A fortnight in Cornwall by car - with hotel stays, restaurant meals, and holiday cottage rental - can easily top 3,000. The same trip in a motorhome, cooking your own meals and staying at campsites, might cost 1,200-1,500 including hire, fuel, food, and site fees. The motorhome is not just transport - it is your hotel, your kitchen, and your living room.

How to Improve Your Fuel Economy

You cannot turn a motorhome into a hybrid, but you can make a meaningful difference to your motorhome diesel consumption with some straightforward habits.

Drive at a steady speed. The single biggest factor in motorhome fuel economy is speed. At 56 mph on the motorway, a motorhome uses significantly less fuel than at 70 mph. The aerodynamic drag increases exponentially with speed, and a motorhome - being essentially a large brick - is particularly affected. Cruise control is your friend. Set it at 58-60 mph and stay in the left lane. You will barely notice the time difference on most journeys, and your fuel bill will thank you.

Check your tyre pressures. Under-inflated tyres increase rolling resistance and reduce fuel economy. Check pressures before every trip when the tyres are cold. The correct pressures are listed on a sticker inside the driver's door or in the vehicle handbook. Even 5 PSI below the recommended pressure can reduce your MPG by a measurable amount.

Don't overload. Every extra kilogram costs fuel. Pack what you need, not what you might need. The camping chairs, the cool box, and the bedding are essential. The three extra pairs of shoes and the hardback novels can stay at home. Water is heavy - 1 kilogram per litre - so if you are just driving between sites with full water hook-ups, travel with a half-full fresh water tank rather than a full one.

Plan your refuelling. Supermarket diesel (Asda, Tesco, Sainsbury's, Morrisons) is consistently 10-15p per litre cheaper than motorway services. Fill up before you join the motorway and plan your stops around supermarkets rather than service stations. The GasBuddy or PetrolPrices apps show real-time fuel prices near your location.

Avoid unnecessary idling. Modern diesel engines do not need to warm up before driving. Start the engine, wait 30 seconds for the oil pressure to build, and drive gently for the first few miles. Sitting in a car park with the engine running achieves nothing except burning fuel and annoying your neighbours.

Use the terrain. Lift off the accelerator when cresting a hill and let gravity do the work on the downslope. Anticipate stops - if you can see a red light ahead, ease off early rather than braking at the last moment. These habits become second nature after a day or two.

A Realistic Fuel Budget

Understanding motorhome fuel costs helps you plan better. For a typical week's motorhome holiday from Pontefract, covering 400-600 miles of mixed driving, budget between 100 and 150 for diesel. For a long weekend of 150-250 miles, 40-70 will cover it. For a two-week European tour covering 1,500-2,000 miles, 350-500 is realistic (diesel is generally cheaper on the continent than in the UK).

These are not small numbers, but they are entirely reasonable for a holiday that includes your accommodation and transport in one package. The motorhome pays for itself in saved hotel nights and restaurant bills. The fuel is just the cost of getting to all those places you have been meaning to visit. For more, see our hire cost guide.