Atlantic Highway · A39 · Devon & Cornwall · Live GOV.UK data

Atlantic Highway fuel cost.

Budget the 70-mile A39 Atlantic Highway from Barnstaple in North Devon to Fraddon in Cornwall. See live South West petrol and diesel prices on the map, then calculate your fuel cost — including the summer-congestion penalty that makes an August run far pricier than the brochure suggests.

⏱ 6-min read Updated 2026-07-20 🏴󠁧󠁢󠁥󠁮󠁧󠁿 England · South West · £ GBP
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Quick answer: Driving the 70-mile A39 Atlantic Highway costs approximately £11 to £15 in fuel for a standard family car — around £11 for a 40 MPG car at average pump prices. In peak summer, heavy holiday traffic around Bude and Wadebridge can add up to 15% to your fuel bill. Despite the name, the A39 is mostly a single carriageway, not a fast dual carriageway. Use the live map above to find the cheapest station before you head into the South West.

70 mi
A39 Barnstaple to Fraddon
£11–£15
Fuel for a standard family car
+15%
Peak-summer congestion penalty
Single
Carriageway — not a fast road

How much does it cost to drive the Atlantic Highway?

Driving the 70-mile Atlantic Highway on the A39 costs approximately £11 to £15 in fuel for a standard family car — about £11 for a 40 MPG car at average pump prices. During peak summer months, heavy congestion can push that 15% higher.

The route links Barnstaple in North Devon to Fraddon in Cornwall, passing close to world-class surf beaches and rugged cliffs. It's a staple of UK domestic holidays, which is exactly why August fuel costs run above the guidebook estimate. Enter your own MPG and today's live price in the calculator below for a precise figure.

Is the Atlantic Highway a dual carriageway?

No — the A39 is predominantly a winding single carriageway, not a multi-lane expressway. Limited overtaking and frequent bottlenecks around towns like Bude and Wadebridge mean fuel economy is often lower than your car's stated combined figure.

Many visitors assume a road called a "highway" will be fast. It isn't. Detours to coastal villages such as Clovelly or Tintagel add extreme gradients — Porlock Hill nearby is one of England's steepest — which further hit economy. Plan for a slower, thirstier drive than the mileage alone suggests.

How does summer traffic affect fuel economy in Cornwall?

The summer influx of holidaymakers and caravans creates severe stop-start traffic around key junctions, and constant idling and low-gear acceleration can cut fuel efficiency by up to 15%.

That's the difference between a £13 run in April and a £15+ crawl in August. Tick the summer-congestion box in the calculator to model it. To avoid the worst, fill up before you arrive: Barnstaple, Bideford, Bude and Wadebridge have the reliable forecourts, and supermarket prices there beat the small independent stations in the tourist hotspots. Search a postcode like EX23 (Bude) on the map above.

Calculate your Atlantic Highway fuel cost

Enter your car's MPG, the distance (70 miles for the full A39, or more with beach detours) and today's live price from the map. Tick the box to add the peak-summer congestion penalty.

Real-world miles per gallon
Full A39 Barnstaple–Fraddon = 70 miles
Enter the live price from the map above
HMRC rate — changes quarterly
Journey fuel cost—
Cost per mile—
Litres needed—
HMRC claim value—
Claim vs fuel spend—

Formula: (miles ÷ MPG) × 4.546 × (price ÷ 100) — 4.546 is litres per imperial gallon.

Driving the South West for work in your own car? Claim the HMRC Approved Mileage Allowance Payment: 45p per mile for the first 10,000 business miles, 25p thereafter — see GOV.UK simplified expenses.

Which fuel does your vehicle need? A plain-English guide

The live map above covers all six fuel grades tracked under the GOV.UK Fuel Finder scheme. Here's what each one means — and how to choose at the pump before you set off.

E10 · Standard Unleaded
Unleaded Petrol

The default pump for most petrol cars. Contains up to 10% ethanol. A small number of older or classic cars require E5 — check your handbook before filling.

E5 · Premium Unleaded
Super / Premium Petrol

Higher octane (97–99 RON) and cleaner-burning. Typically 10–20p/litre more expensive. The protected grade for older engines not approved for E10 — and popular with performance cars.

B7 · Standard Diesel
Diesel

The default diesel pump. Contains up to 7% biodiesel. Suitable for all diesel passenger cars, vans and most HGVs. Generally 2–8p/litre cheaper than premium diesel at the same station.

B7 · Premium Diesel
Premium Diesel

Includes detergent and cetane-boosting additives. Sold as BP Ultimate Diesel, Shell V-Power Diesel and similar. Use the Premium Diesel toggle to compare the price gap near you.

B10 Diesel
B10 Diesel

Contains up to 10% FAME biodiesel — higher renewable content than B7. Only suitable for vehicles whose manufacturer explicitly approves B10. Always check your handbook first.

HVO · Renewable Diesel
HVO100 / Hydrotreated Vegetable Oil

Drop-in renewable diesel with up to 90% lower lifecycle carbon than fossil diesel. Compatible with most modern diesels — check your handbook. Use the HVO filter above to find nearby stations.

Where should you refuel on the A39?

Fill up in the larger towns at each end and along the route — supermarket forecourts there are far cheaper than the independent stations in the coastal resorts.

North Devon Start
Barnstaple & Bideford

Widest choice of supermarket fuel before the A39 heads west — fill up here.

Mid-route
Bude

The main refuel point on the Cornwall border, and a notorious summer bottleneck — expect queues in August.

Detours
Tintagel & Clovelly

Steep coastal detours with little or no fuel — top up on the A39 first before dropping down to the coast.

Cornwall End
Wadebridge & Fraddon

Supermarket forecourts near the A30 junction at the southern end of the route.

Two things the tourism boards rarely admit, both answered here: the A39 is not a dual carriageway — it's a mostly single-carriageway road that bottlenecks around Bude and Wadebridge — and peak-summer congestion cuts fuel efficiency by roughly 15% on the 70-mile route. For live prices anywhere in Devon and Cornwall, this page shares the GOV.UK dataset behind our UK-wide fuel map.

Fuel & driving

The Atlantic Highway in summer: holiday traffic, single carriageways and fuel

By CalculatorDashboard Editorial Team·Updated ·Reviewed ·3 min read

The A39 Atlantic Highway runs about 70 miles from Barnstaple in North Devon, past Bideford and Bude, and into Cornwall towards Wadebridge and Fraddon. It's the main route along this coast, not a quiet scenic lane, and that shapes how much fuel it uses. Most of it is single carriageway, shared by holiday traffic, local deliveries, tractors and caravans.

Why summer costs more

Out of season, the A39 is a steady, economical road with some long climbs and descents into river valleys. In July and August it's a different journey. Queues build behind slow vehicles with few safe places to overtake, and junctions for popular beaches and towns slow everything down. Stop-start driving and long periods at low speed can cut economy by around 15%. Leaving early in the morning or travelling on weekdays outside school holidays makes a bigger difference than anything you can do behind the wheel.

A cost example

Suppose you drive the full 70 miles in a car that normally returns 45 mpg, with petrol at an illustrative 140p a litre. On a quiet day that's about £9.90 of fuel. In heavy summer traffic, with a 15% economy loss, it's closer to £11.40. Over a fortnight's holiday of beach trips up and down the coast, those differences add up.

Side trips and steep lanes

Many of the best stops along this coast, from Tintagel to Boscastle and the beaches north of Bude, are reached by steep, narrow lanes. Clovelly is car-free, and visitors park at the top. Those short side trips can use more fuel than their mileage suggests, especially climbing back up from a cove with a full car.

Refuelling

Fuel is easy to find in Barnstaple and Bideford, in Bude, and around Wadebridge and Fraddon, where the A39 meets the A30. Between those towns, forecourts are fewer, and some smaller ones have limited opening hours. For an electric car, charge in the larger towns and expect busy rapid chargers on summer Saturdays, when holiday lets change over.

Planning around changeover day

Many holiday lets on this coast change over on Saturdays, and that's when the A39 and the roads into Cornwall are at their busiest. If you can, travel on a weekday, or set off very early or later in the evening. Leaving Barnstaple at 6am on a summer Saturday can halve the journey time compared with leaving at 10am, and the fuel saved by avoiding queues comes as a bonus.

Hills between the river valleys

The A39 crosses a series of river valleys on its way south, and each one means a descent and a climb. Using engine braking on the way down and building speed gently on the way up keeps economy closer to the car's normal figure. Caravans and heavily loaded cars feel these climbs most, and towing drivers should expect much lower economy than solo.

Bude and beyond

Bude makes a natural midway stop, with fuel, food and some of the best beaches on this coast. North of Bude, the road runs inland across high, open ground, where crosswinds can be strong. South of it, the turnings to Boscastle and Tintagel lead down narrow, winding roads, which add time even though they add little distance.

A second example: beach days from a base

A family staying near Bude for a week, making daily trips of 20 to 30 miles to beaches and attractions, might drive around 175 miles in total. In a car averaging 45 mpg at an illustrative 140p a litre, that costs about £25. Heavy traffic on summer afternoons can push it towards £29, so heading out early and returning before the evening rush saves both fuel and patience.

Atlantic Highway fuel questions

The Atlantic Highway follows the A39 for about 70 miles from Barnstaple in North Devon to Fraddon in Cornwall, near the A30. It runs close to the north coast's surf beaches and cliffs, though it doesn't hug the coast the whole way.
No. The A39 is predominantly a winding single carriageway with limited overtaking and frequent bottlenecks, especially around Bude and Wadebridge. Fuel economy is usually lower than your car's combined MPG figure because you can't hold a steady cruising speed.
Badly. Holiday traffic and caravans create stop-start queues around key junctions, and constant idling and low-gear acceleration can cut fuel efficiency by up to 15%. Tick the summer-congestion box in the calculator to see the effect on your bill.
Yes, especially on detours to coastal villages like Clovelly and Tintagel, and nearby Porlock Hill is one of England's steepest at around 1-in-4. Steep climbs force low-gear driving that burns more fuel, so factor them in if you plan to explore the coves.
Supermarket forecourts in Barnstaple, Bideford, Bude and Wadebridge are cheapest. Avoid filling up in the small coastal resorts, where independent stations charge a tourist premium. Search a postcode on the live map and sort by cheapest.
The core 70-mile A39 run needs about 7–10 litres for an average car — roughly £11–£15. A longer trip taking in beaches and detours obviously uses more. Enter your MPG, the miles and today's live price in the calculator for your exact figure.
For genuine business travel, yes. The HMRC Approved Mileage Allowance Payment is 45p per mile for the first 10,000 business miles in your own car and 25p thereafter; company cars use the quarterly Advisory Fuel Rates. The calculator shows an indicative claim value.

Planning fuel for another drive, or the wider cost of your trip? These help.

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Data & estimate disclaimer: Live fuel prices are sourced from the GOV.UK Fuel Finder API under the Motor Fuel Price (Open Data) Regulations 2025. While every forecourt is legally required to report price changes within 30 minutes, CalculatorDashboard.com does not guarantee the accuracy or completeness of third-party data — always verify the displayed price at the pump before fuelling. Journey fuel-cost figures are estimates only: real-world consumption varies with driving style, load, weather and traffic, and quoted route distances and MPG penalties are approximate. HMRC advisory rates are shown for guidance and change quarterly — check the official rate before submitting a claim. Not financial or tax advice. CalculatorDashboard.com is not affiliated with any fuel retailer, supplier or government body.