E85 vs Regular Gas Calculator

E85 contains more ethanol and a higher octane rating than regular gasoline, potentially offering more power in compatible vehicles. However, it typically results in lower fuel efficiency, fewer miles per gallon (MPG), and may not be suitable for all cars. The choice depends on your vehicle’s compatibility, performance needs, and cost considerations.

E85 vs. Regular Gas Calculator

E85 vs. Regular Gas Cost Calculator

AspectE85Regular Gasoline
Ethanol ContentApproximately 51% to 83%Typically up to 10%
Octane RatingAround 105Varies (usually 87-93)
CostOften cheaperGenerally more expensive
Fuel Efficiency (MPG)Lower (typically 20-30% less)Higher
Vehicle CompatibilityMostly flex-fuel vehiclesCompatible with most cars
AvailabilityLimited, not widely availableWidely available
Energy ContentLess energy per gallonMore energy per gallon
Performance PotentialHigher horsepower potentialDepends on engine/design
Environmental ImpactLower greenhouse gas emissionsVaried impact depending on source
Cold Weather StartingMay have difficulty in cold weatherLess affected by temperature


Should I get E85 or regular gas? It depends on your vehicle’s compatibility and your priorities. Regular gas is more widely available, while E85 may be cheaper but less energy-dense.

Does E85 give more MPG? E85 typically provides lower fuel efficiency compared to regular gasoline, resulting in fewer miles per gallon.

What happens if you put E85 in a regular car? Using E85 in a non-flex-fuel vehicle can lead to engine damage and poor performance because E85 has a higher ethanol content than regular gasoline.

Where can I buy E85 in the UK? E85 availability in the UK is limited. It’s not commonly found, so you may need to search for specific stations or inquire with fuel providers.

What is the difference between E10 and E85? E10 contains up to 10% ethanol and is compatible with most vehicles. E85 contains 51% to 83% ethanol and is typically for flex-fuel vehicles only.

What are the downsides of E85? Lower fuel efficiency, less widespread availability, potential engine compatibility issues, and it may not be suitable for all vehicles.

Why is E85 so expensive? E85’s cost can vary, but it may be more expensive due to lower demand and production costs associated with ethanol.

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Will E85 clean my engine? E85’s ethanol content can have some cleaning properties, but it’s not a substitute for regular maintenance.

Does E85 give more horsepower? E85 can provide a slight increase in horsepower in some high-performance, flex-fuel engines due to its higher octane rating.

What vehicles can run on E85? Flex-fuel vehicles (FFVs) are designed to use E85, but not all vehicles are compatible.

Can I switch from E85 to unleaded? In a flex-fuel vehicle, you can switch between E85 and unleaded gasoline without issues. In non-FFVs, it’s not recommended.

What is the octane rating of E85? E85 typically has an octane rating of around 105, making it higher than most regular gasoline.

Is E85 legal in the UK? E85 is legal in the UK, but its availability is limited.

Why is E85 not in the UK? Limited demand, infrastructure, and challenges in sourcing ethanol contribute to its scarcity in the UK.

Why is E85 not widely used? E85 faces challenges due to limited availability, compatibility issues, and its lower fuel efficiency.

Is E85 the same as super unleaded? E85 and super unleaded are not the same. E85 contains a much higher ethanol content.

Can you run E85 in an E10 engine? Running E85 in an E10 engine is not recommended, as it may not be compatible and could cause damage.

Is E85 the same as E5? No, E85 and E5 have different ethanol contents. E85 contains much more ethanol than E5.

Is E85 worth it for daily driving? E85 may not be cost-effective for daily driving due to its lower fuel efficiency, unless you have a flex-fuel vehicle and it’s significantly cheaper.

Why do people like E85? Some like E85 for its potential performance benefits, support for domestic ethanol production, and potentially lower costs.

Does E85 add more HP than 93 octane? E85 can provide more horsepower than 93 octane in specific high-performance setups due to its higher octane rating.

Why do some cars run better on E85? Certain high-performance and flex-fuel vehicles are designed to optimize performance with E85 due to its high octane rating.

Why does E85 burn so fast? E85 burns faster than gasoline due to its higher oxygen content, which can lead to higher power output but also decreased fuel efficiency.

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Does E85 make your car faster? In some cases, E85 can increase a car’s speed and acceleration due to its higher octane rating and greater potential for power.

Does E85 damage injectors? E85 can potentially harm fuel system components not designed for its higher ethanol content, including injectors.

How long can E85 sit in the tank? E85 can start to degrade within a few weeks if left unused, so it’s best to use it relatively quickly.

Is it good to run E85 sometimes? Running E85 occasionally may be fine in a flex-fuel vehicle, but it’s important to consider compatibility and performance.

Do engines run hotter on E85? E85 can run slightly cooler than gasoline due to its higher heat of vaporization.

Does E85 need more timing? E85 may require different engine timing settings for optimal performance compared to gasoline.

Why is E85 better for Turbo? E85’s higher octane rating can be beneficial for turbocharged engines, as it allows for increased boost and power.

Can you run 100% ethanol? Running 100% ethanol in a non-FFV can cause engine damage. It’s typically used in racing or specialized applications.

Can you put gasoline in an E85 car? Flex-fuel vehicles can run on gasoline without issues, but it may result in reduced performance.

Do most cars take E85? Most cars are not designed for E85, so it’s important to check compatibility.

Can I use E85 instead of diesel? No, E85 cannot replace diesel fuel. They have different properties and combustion characteristics.

What happens if I put 93 instead of E85? If your vehicle is designed for E85, using 93 octane gasoline may result in decreased performance and efficiency.

What does E85 stand for? E85 stands for “Ethanol 85,” indicating its ethanol content.

How much energy does E85 have compared to E10? E85 has less energy content per gallon compared to E10 due to its higher ethanol content.

What octane is E10? E10 typically has an octane rating similar to regular gasoline, around 87-89.

Which UK petrol has no ethanol? In the UK, some stations offer ethanol-free petrol, but it’s not common. Look for stations advertising “E0” fuel.

Does premium fuel have ethanol in the UK? In the UK, premium fuels can contain ethanol, but it varies by station and brand.

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Can you run E85 on any injector? E85 may require different injectors or modifications in some cases to ensure proper fuel delivery.

Can you get E85 in Europe? E85 availability in Europe is limited, with more options in some countries than others.

Is E85 better than 98? E85 and 98 octane have different properties; the choice depends on your vehicle’s compatibility and performance requirements.

Why is E85 called E85? E85 is named after its ethanol content (85% ethanol).

How bad is MPG on E85? MPG on E85 is typically worse compared to gasoline, often 20-30% lower.

How many MPG does E85 get? The actual MPG on E85 varies depending on the vehicle, but it’s generally lower than with gasoline.

Why is E85 harder to start? E85 can be harder to start in cold weather due to its lower vapor pressure.

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