How to Improve Fuel Average: Real-World Tricks That Added 6–9 MPG to Every Car I’ve Owned

My name is Arjun Mehta. I’ve been obsessed with fuel economy since 2007, when petrol crossed ₹50/litre in India and I was a broke engineering student driving a bone-stock 2003 Maruti Zen with a dead odo. Over the last 18 years I’ve tracked every single tank—over 2,100 fill-ups logged in a spreadsheet—for 19 different cars ranging from a 1998 Premier Padmini to a 2024 Hyundai Verna Turbo. I’ve hypermiled, I’ve modified, I’ve coached fleet drivers, and I once helped a friend push his 2015 Swift Diesel from 19 kmpl city to 28.4 kmpl city over six months (yes, we have the Fuelly logs).

These are not generic “drive slowly” tips. These are the exact changes that actually move the needle, ranked roughly by impact in the real world.

The Brutal Truth Most Blogs Won’t Tell You

80–90 % of your fuel average is decided by three things:

1. How you press the accelerator and brake pedals (40–50 %)
2. Tyre rolling resistance and pressure (15–20 %)
3. Total vehicle weight and aerodynamics (15–20 %)

Everything else—air filter, spark plugs, 0W-20 oil—is usually 2–4 % at best. Focus on the big rocks first.

H2: How to Improve Fuel Average with Driving Technique (The 5–10 kmpl Swing)

The Single Biggest Lever: Pulse and Glide (P&G)

Most people drive at constant throttle. That’s the worst possible way on Indian roads.

Here’s what actually works:

• Accelerate moderately to 5–10 km/h above the flow of traffic (pulse)
• Lift off completely and let the car coast in gear (glide) until you drop 10–15 km/h
• Repeat

On my 2020 Honda City i-VTEC, this single technique jumped city mileage from 11.8 → 17.4 kmpl in peak Bangalore traffic. Yes, 47 % gain. Same roads, same time of day, same A/C setting.

Brake = Sin

Every time you touch the brake pedal, you’re literally burning money. Anticipate lights 300–400 metres ahead. Lift off early. I routinely roll to a complete stop from 60 km/h without touching the brake pedal.

The 50–60 km/h Sweet Spot

For almost every 1.2–1.5 L NA petrol car sold in India, peak brake-specific fuel consumption happens around 50–60 km/h in the highest gear. On my wife’s Baleno, 50 km/h in 5th gear gives 38–40 kmpl instantaneous (scangauge reading). Cruising at 80 gives 24–26. The difference is huge when traffic allows that speed.

A/C Strategy Most People Get Wrong

Full blast A/C at low speed kills mileage. Here’s what works:

• Below 45 km/h → windows down, A/C off (unless it’s 40 °C outside)
• Above 50 km/h → windows up, A/C on (aerodynamic drag of open windows costs more than compressor)

I gained 2.1 kmpl in my Creta Diesel just by following this rule religiously.

H2: How to Improve Fuel Average with Tyres (The Silent 3–6 kmpl Killer)

Run 3–4 psi Above Placard (Yes, Really)

Every 1 psi under-inflation costs roughly 0.4–0.6 % fuel economy. I run 36–38 psi cold on cars that recommend 32–33 psi. Ride is slightly harsher, but I’ve never had uneven wear and the mileage gain is massive.

Real data from my i20:

• 32 psi → 16.8 kmpl mixed
• 38 psi → 19.3 kmpl mixed (15 % gain)

Switch to Low Rolling Resistance Tyres

Michelin Energy XM2+, Yokohama Earth-1, Bridgestone Ecopia, Apollo Alnac 4G—these are worth every extra rupee. I switched from stock JK/Apollo to Michelin Primacy 4ST on my Verna 1.5 Turbo: 17.2 → 20.9 kmpl highway. Same driving style.

Alignment and Balancing Every 10,000 km

A dragging brake or toe-out alignment can cost 10–15 % without you noticing any pull. I check alignment the moment mileage drops more than 1 kmpl suddenly.

H2: How to Improve Fuel Average by Reducing Weight and Drag

The 100 kg = 1 kmpl Rule of Thumb

Every 100 kg removed is worth roughly 0.7–1.2 kmpl depending on city vs highway.

I stripped my old Zen:

• Spare wheel + tools out → +1.1 kmpl
• Rear seat removed (weekend track toy) → +1.8 kmpl
• Removed sound deadening → +0.6 kmpl

Even simple stuff like emptying the boot adds up. My dad gained 0.9 kmpl in his Innova just by removing two crates of old files he was carrying for six months.

Aero Hacks That Actually Work in India

• Remove roof rails/crossbars if you never use them (+0.5–1 kmpl highway)
• Tape the gap between bonnet and bumper (poorly aligned panels create turbulence)
• Partial grille block in winter (only if you monitor coolant temp)

I once taped the upper grille on my Swift Diesel in December—gained 2.1 kmpl on a Delhi–Jaipur highway run (coolant temp stayed 88–92 °C).

H2: Maintenance Hacks That Give Measurable Gains

Clean MAF Sensor and Throttle Body Every 20–25k km

A dirty MAF causes 5–15 % rich mixture. CRC MAF cleaner + throttle body cleaning costs ₹600 and usually adds 0.8–1.5 kmpl.

Fuel Injector Cleaning (The Most Underrated Service)

Every 40–50k km, pour a bottle of Liqui Moly or System-G injector cleaner 200 km before fill-up. My 2014 Polo 1.6 TDI went from 19.2 → 22.8 kmpl after one bottle + walnut blasting.

Use Only Top-Tier Fuel (XP95, Power, Speed, TurboJET)

The difference is real. My tracked data:

• Normal BPCL → 17.1 kmpl
• Speed 95 → 18.6 kmpl (same pump, same car, same route)

The extra ₹4–6/litre pays for itself in 3–4 tanks.

Engine Oil: Lower Viscosity = Real Gains (But Only If Spec Allows)

Switching from factory 5W-30 to 0W-20 in my City (Honda allows it) gained 0.9 kmpl city, 1.3 kmpl highway. Measured over 18 tanks.

H2: The Ultimate “How to Improve Fuel Average” Checklist I Give My Students

Do the first four and you’ll beat 95 % of drivers on the road.

H2: Real-Life Case Studies (With Fuelly Links)

1. 2017 Maruti Dzire Diesel – Friend’s cab
   Starting: 18.2 kmpl Delhi traffic
   After 3 months coaching + 38 psi + Speed 97 + P&G: 26.9 kmpl
   Monthly saving: ~₹9,500 at 1,80,000 km/year
2. My own 2024 Verna 1.5 Turbo DCT
   First tank (break-in): 12.8 kmpl
   Current (22,000 km): 21.6 kmpl city, 25.8 highway
   Techniques: 38 psi Michelin Primacy 4ST, 0W-20 oil, strict P&G, XP95 only

Final Words: Start with One Change Today

Pick the easiest one—check your tyre pressure right now. If any tyre is below placard by even 4 psi, pump it up. You’ll see the difference in your very next tank.

Then add one new habit every week. In three months you’ll be that annoying friend who gets 25+ kmpl in a petrol SUV while everyone else complains about 12.

I still keep that 2007 notebook where I wrote 29.8 kmpl in my Zen on the Mumbai–Pune expressway (windows up, 52 km/h average, no A/C, 41 psi tyres). That car taught me everything.

Now it’s your turn.

Drop your car model and current fuel average in the comments—I reply to every single one and tell you the low-hanging fruit for your specific car.

Drive smart, save big.

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