Car Passionate

Useful Tips to Improve Your Gas Mileage

You know how it is, you buy a car expecting the manufacturers claims about gas mileage to be truthful. And the reality is that they’re set under laboratory conditions, so you’re never going to reach that level of consumption, and that’s from brand new. Add a few thousand miles on the odometer, and it’s like a lottery, but these great tips will help you improve your gas mileage.

Understanding MPG

First up, we need to understand just how and why gas mileage varies so much.

All manufacturers are now under CAFE legislation, this is Corporate Average Fuel Economy, meaning that across their range, they need to comply with a set figure. Although they may have a 500+ horsepower fire-breathing monster, they also need to try and offset that with something that produces nothing more than unicorn friendly gas from the tailpipe.

It’s long been known that emissions figures are somewhat … unrealistic, and that’s down to the way that the figures are measured – an engine is tested in a dyno cell, with controlled temperatures, loads and pressures, plus it’s ‘driven’ in such a way that would be simply un-achievable in the real world. And of course, there is no wind resistance or further external elements that could reduce the efficiency of the motor, this all adds up to a huge miles per gallon performance.

Even when the whole vehicle is tested on a rolling road, it still favors the manufacturer, and then of course, we have instances such as the great Volkswagen scandal of 2015, which is estimated to have cost the brand around $55bn to date. The owners based in the UK still haven’t received any form of payout as yet, with VW offering to remove the defeat device free of charge.

Gas Mileage

Your gas mileage can be affected by so many things – from general wear on the engine (making it less efficient), through to mechanical deficiencies, wind resistance, weather (particularly on a forced induction engine), or just plain old neglect.

The good news is that finding a few extra mpg’s is relatively easy and cheap. There’s no reason why you can’t achieve the same as a vehicle that’s new, and perhaps even a few more with the right choice of accessories.

Which brings me nicely to my next point … fuel maximizers, cheat devices, combustion technology … whatever you call them, 99% of it is hokum.

It’s difficult to single one out (there are quite literally hundreds), but essentially the marketing schmooze will tell you that they work through changing the properties of the air, the burn or by fooling the engine’s control unit in to thinking the air temperature is different. Whilst it’s true that you may find one that has a very minor effect on the fueling strategy, we’re talking <0.5%, so will take forever to even pay for itself, never mind give you a return.

Simple Effects

The very first item of business should be ensuring that your car is well serviced. If you’re looking to make things better, you need to start with a good baseline, and for that, you need to put the engine as close to manufacturers specification as possible – having your exhaust manifold leaking gases everywhere under the hood is more than dangerous, it’ll cost you efficiency … any significant problems should be dealt with first.

Equally, a brake pad and rotor that’s sticking slightly could be costing you around 7% of mpg, so whatever you do, you’re fighting a losing battle (and it will only get worse).


Once you’ve made sure that the car is in good mechanical condition, there are a few things that you should do. Starting literally from the ground up – the tire’s rolling resistance can account for around 30% of fuel consumption, and a 10% drop in tire pressure will affect the efficiency of any tire – that could be as little as 3 pounds of pressure.

You should always try and keep your tires correctly inflated – grab a mobile tire inflator with gauge to keep in your toolkit or trunk, and you’ll never need to worry about them again.

Having said that, some brands are now manufacturing energy saving tires that could see you saving around 7.5% on your fuel bill, definitely worth it if you’re a high-mileage driver.

Intake Filter

For those of you that like to mod your car, or find that extra few horsepower, performance intake filters are a huge thing … quite often releasing around another 5 horsepower, which may not sound a lot, but when you’re looking for everything possible, it’s worth it.

a dirty intake filter

But, a dirty intake filter is one of the biggest culprits for costing you money. You’ll lose around 10% of the engines efficiency if you don’t replace the intake filter regularly, and it doesn’t need to be some fancy schmancy filter, a standard filter or even aftermarket is better than a dirty one.


How many of you have roof bars fitted to your vehicle? They sure do give a rugged look, and of course, they’re useful if you’re carrying plenty of stuff, but what happens if you’re just driving around with them fitted for no reason? (I’m as guilty as anyone for this). Just because they finish the styling of your vehicle?

I have bad news for you … depending on the vehicle and the roof bars, they could be robbing up to 25% of your fuel efficiency … that’s like setting fire to twenty-five bucks each time you gas up, just because they look great.

And it doesn’t stop there – pickup truck owners that don’t utilize a tonneau cover are losing up to 10% in fuel efficiency … imagine both of those together? You may as well junk that small 3.2 V6 and get a V8.


So here is where it gets slightly more complicated … engine tuning. More specifically, diesel tuning.

Yes, we all know that diesel is the work of the devil, but a monster V8 supercharged diesel just gives mountains of torque … enough to lug the world around, and if that’s your thing, getting it reworked properly could be a potential money saver.

The math is simple – the engine is creating more power, so doesn’t need to be driven as hard to give the same work-rate, which means that driving like-for-like will save you money. The problem is that once you’ve got more power, it’s nice to use it, and if you do, you’ll actually be paying more money out. It’s almost like a catch 22 situation, purely dependent on how restrained you can be with your gas pedal.

Gas Saving

Truthfully, these gas saving tips will save you money, perhaps give you up to an extra 30% in efficiency, but that really does depend on what you’re working with to start on. … A brand new vehicle without all the roof bars or dirty intake filter won’t improve much, with that said, energy saving tires will still save you dollars at the pump.

The final thing that you should think about is driving style. Foot to the firewall, driving like your hair is on fire will use plenty’o’gas, whereas a more refined style with gentle acceleration, braking and minimal input will help you join the hypermiling club.