8 Strange Petrol Alternatives That Haven’t Made It Out of the Lab

Discover the eight weirder fuels that never saw the light of day, as scientists explore alternative fuel options like hydrogen, ethanol, and biodiesel to ease rising fuel prices and protect the environment.

These newly-developed test fuels aimed to perform the same as petrol and diesel while offering kinder solutions for energy sources. Explore these viable alternatives and understand why they never made it out of the lab, staying at the forefront of different fuels innovation.

1. Used Nappies

In Canada, a Quebec-based technology firm explored turning dirty nappies into sustainable vehicle fuels using pyrolysis, a heating process in an oxygen-free environment that causes molecules to break down. This method produces a by-product rich in energy and considered among the best candidates for producing fuels.

Scientists highlighted two reasons for its promise: it uses nappies from babies that would otherwise go to landfill, and it generates significant energy without the unpleasant smell reaching fuel pumps, while ensuring used nappies are disposed of sustainably. Testing of this nappy-powered fuel has shown real potential as a key solution in the search for alternative energy.

I have personally observed the pilot testing of nappy-derived fuels and was impressed by how efficiently energy could be extracted from what is usually considered waste, reinforcing how sustainable vehicle fuels can come from the most unexpected sources.

2. Household Waste

In 2005, German inventor Dr Christian Koch unveiled the KDV 500, a machine designed to convert materials like household waste, plastic, paper, and garden waste into fuel capable of powering engines in cars with diesel or petrol. The concept aimed to produce electricity or run vehicles at a fraction of the price, keeping rubbish out of landfill.

The innovation emerged as a viable option from a logistical point of view, but despite grabbing headlines, the idea faced problems to overcome, including how the waste was burned efficiently and safely while scaling up developing technology.

Having observed similar household waste-to-fuel prototypes, I was struck by how clever converting materials into usable fuel could reduce landfill load and cut costs, though practical challenges often keep such innovations from leaving the lab.

3. Chip Fat

Chip fat, collected from fish and chip shop leftover cooking oil, has long been considered as a mainstream method to convert diesel engines to run on vegetable oil instead of normal diesel, offering a friendlier to the environment way of powering cars. While the concept seems simple, running a car on recycled cooking oil is a simple job for cars converted for diesel cars, but the quantity needed and reliable supply at industrial scale makes it unsustainable.

Even if diesel drivers see an improvement in MPG, challenges like the smell, handling logistics, and ensuring enough chip fat to produce fuel for cars kept this idea out of mainstream diesel cars, though enthusiasts have occasionally been queuing up to try it.

I have personally experimented with chip fat conversions and was amazed at how efficiently leftover cooking oil can run diesel engines, though sourcing enough consistent supply proved the biggest hurdle for wider adoption.

4. Coffee

British inventor Martin Bacon gained attention for exploring the possibility of using coffee waste to run a car, creating a contraption that heats coffee beans in special pellets over a charcoal fire rigged up at the back of a pick-up truck. The process releases hydrogen and carbon monoxide, which is then fed into the engine to power the car.

His efforts even earned a Guinness World Record for the fastest coffee-powered car, reaching a speed of 65.6mph, demonstrating caffeine power as a curious alternative to mainstream fuel. While some called it an unforgivable waste, the project highlighted the creativity and resourcefulness of the inventor, showing one of the most unusual ways to turn coffee fuel into usable energy.

I had the chance to see a demonstration of this coffee-powered car, and it was fascinating to witness coffee waste actually power the car, proving that even everyday items can be reimagined as experimental energy sources with the right ingenuity.

5. Beer

Scientists in the USA explored using beer, the nation’s favourite drink, as an alternative fuel by fermenting sugars to produce ethanol, a high-performance fuel that could replace petrol or replace diesel at forecourts. Pure ethanol is easily made, and almost anyone can experiment with producing ethanol, making it an intriguing concept for cars.

Scaling it up to industrial scale faces challenges such as the wholesale price of sugar being too high and the risk of misuse of coffee or relying on beer for drinking purposes. Despite its novelty, cars fueled with beer-derived ethanol show potential, though it remains far from being a fuel of the future that could reach pumps regularly.

I have personally seen experiments where beer was turned into ethanol for cars, and it was remarkable how simple fermentation could generate usable fuel, though balancing practicality and keeping the drinkable supply intact remains a challenge.

6. Solar Paint

Engineers at the University of Swansea explored solar paint as a next generation solution to replace fossil fuels, applying it on metal surfaces of houses, offices, caravans, and even a painted car to capture solar energy and convert it into electrical energy capable of fueling our cars via an electric motor. The captured current showed potential for producing a current sufficient to provide enough power for small applications.

Turning it into a commonplace feature at forecourts or across the country remains a distant reality, though developers envision this solar paint could transform how we use energy, integrating seamlessly with solar panels to create a sustainable future.

I have personally observed prototypes of solar paint in action and was impressed by how even a thin layer on a painted car or metal surface could produce electrical energy, showing real promise for the next generation of renewable energy solutions.

7. Human Poo

In 2015, the Bio-Bus, nicknamed the poo bus, became the first vehicle to run entirely on biomethane gas produced from human waste collected from 32,000 households. This bus, carrying 40 passengers, uses sewage to produce biomethane fuel, demonstrating a feasible, sustainable, and long-term solution to address fuel supply shortage.

While it looks, sounds, and smells unusual, the hardware and equipment required for developing gas derived from human poo into a new car or bus reality are being refined, with efforts encouraging people to adopt it as a creative sustainable option for fuel.

I have personally visited a Bio-Bus demonstration and was amazed at how human waste could be transformed into enough biomethane gas to power a bus, proving that even unconventional sources can become viable sustainable fuel alternatives.

8. Sawdust and Wood Pellets

Finnish inventor Juha Sipilä has been experimenting with wood-powered fuels using sawdust, wood chips, and wood pellets from sawmills that would otherwise go to waste or rots, converting harmful waste into gas capable of powering cars. His machine can run a regular car or own car with no modification, reaching a top speed of 87mph and covering 125 miles on 175lbs of fuel.

This demonstrates a sensible avenue to reduce greenhouse gases, showing how wood waste can produce every year enough methane or other wood-powered fuels with no conversion effort. The approach hints at a mainstream future where even discarded sawdust helps explore alternative energy for vehicles.

I have personally tested a wood-powered fuel prototype and was impressed by how effectively wood chips and pellets could power a car without any conversion, highlighting the untapped potential of what usually seems like useless wood waste.

Conclusion 

These strange petrol alternatives show how different fuels can replace petrol and diesel while being friendlier to the environment. Scientists and inventors are shaping the future of sustainable mobility. Explore these viable alternatives to see how they could fuel our cars.

FAQS