E20 mileage
The official figures are specific and published. The national roadmap puts the effect at roughly 1–2% for cars calibrated for E20 and 6–7% for older cars designed before ethanol blends, and FuelSaathi plans your fuel budget with 5–7% headroom built around the top of that official range — so real-world costs come in at or under plan. Then you measure your own car and replace the assumption with your number.
The official figures
Each figure below is the published one, linked to the document that states it. None of them is a guess, and none of them is a reason to worry — the largest is the planning margin FuelSaathi adds on your behalf.
The national expert-committee roadmap puts the mileage effect at roughly 1–2% for cars calibrated for E20 and 6–7% for older cars designed before ethanol blends — specific, bounded numbers for both generations of the fleet.
Roadmap for Ethanol Blending in India 2020–25, NITI AayogARAI's validation note — covering field and laboratory programmes of 40,000 to 60,000 km — places the fuel-efficiency effect of E20 within what it describes as a narrow 2–6% range, with real-world variation driven by driving style, roads and vehicle condition.
Open the ARAI validation noteFuelSaathi budgets your fuel costs with deliberate 5–7% headroom, built around the top of the official NITI Aayog range — so the plan absorbs traffic, weather and load before they can surprise you.
See your plan on the homepageEthanol carries less energy per litre than pure petrol; calibration is what keeps the effect small in cars tuned for the blend. That is why the calibrated figure describes E20-ready cars, why older cars sit higher in the official table — and why FuelSaathi's planning band is built to the top of that range for every car it plans.
Measure, don't guess
Percentages describe fleets; your car produces a single, measurable figure. Three complete fill-to-fill readings across broadly similar journeys give you a real baseline — and every tool below runs privately in your browser.
Set your usual km/l and fuel price to see litres and cost per 1,000 km, trip costs and refuelling savings — with the planning headroom already built in.
Open the mileage plannerRecord the odometer and litres at each full tank. The journal computes your real km/l trend across fills and stays in this browser — nothing is uploaded.
Start the journalCorrect cold tyre pressure, progressive acceleration, route planning and a healthy air filter move your number more than fuel chemistry does.
Open the driver knowledge deskMileage planning starts from a car that is confirmed for the fuel. For nearly every petrol car the answer is yes — verify yours in 30 seconds, with the official document behind the verdict.
Is my car E20 compatible? Check in 30 seconds · Find your car in the catalogue
