How to improve your gas mileage? - Hyundai Forums : Hyundai Forum
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#1 Old 01-04-2013, 08:27 AM
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How to improve your gas mileage?

Other than being light footed and paying attention to the ECO mode light, has any ever tried other options to maybe improve gas mileage?

Things like:
Open source tuning
K&N drop-in filter
Higher octane fuel
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#2 Old 01-04-2013, 08:47 AM
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Given the millions that car manufacturers spend on the electronic mapping within the engine ECU, the chances of actually improving the mpg are slight (but not impossible) and many owners think they see an improvement from the trip computer but that's being affected by the modifications and no real improvement is actually occuring.

K&N filters increase maximum airflow but the engine will still only suck in as much air as it wants so without engine modifications this has no value, especially as the MAF/MAP and Lambda sensors will adjust the fuelling to suit the airflow anyway - it will increase the engine wear rate and reduce long-term reliability by filtering fewer particles.

Modern engine management systems can utilise higher octane fuel and provide more power or better economy, but not both, but the increased price almost always outweighs the economy increase.

If you want to improve your mpg, buy a turbo-diesel !

RT

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#3 Old 01-04-2013, 10:42 AM
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Originally Posted by Ruperts Trooper View Post
Given the millions that car manufacturers spend on the electronic mapping within the engine ECU, the chances of actually improving the mpg are slight (but not impossible) and many owners think they see an improvement from the trip computer but that's being affected by the modifications and no real improvement is actually occuring.

K&N filters increase maximum airflow but the engine will still only suck in as much air as it wants so without engine modifications this has no value, especially as the MAF/MAP and Lambda sensors will adjust the fuelling to suit the airflow anyway - it will increase the engine wear rate and reduce long-term reliability by filtering fewer particles.

Modern engine management systems can utilise higher octane fuel and provide more power or better economy, but not both, but the increased price almost always outweighs the economy increase.

If you want to improve your mpg, buy a turbo-diesel !
Thanks for the response.

I was always under the impression the the K&N filters were of better quality than the OEM filters, or is that not true? So I don't know how it could increase engine wear if it is more efficient.

I guess I could try once with a higher octane and see if there is truly an increase in mileage and calculate if the increase in price is worth it or not, that is even if there would be in increase in mileage.

As for the Turbo-Diesel... not available in North America...
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#4 Old 01-04-2013, 11:14 AM
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Quote:
Originally Posted by Mayobeach View Post
Thanks for the response.

I was always under the impression the the K&N filters were of better quality than the OEM filters, or is that not true? So I don't know how it could increase engine wear if it is more efficient.

As for the Turbo-Diesel... not available in North America...
Efficiency depends on what's being measured - K&Ns are more efficient at flowing air but less efficient at filtering the air - I contend that a filter's only function is to filter!

Keep reminding the importer/manufacturers that they are allowed to change their mind and respond to public demand by selling diesels in North America - Hyundai-Kia are very well placed with an excellent range of I4 2.2 and V6 3.0 turbo-diesels that are already engineered to fit the gasoline vehicles you currently buy.

RT

2011 Santa Fe 2.2CRDi Premium 7-seat automatic (often being tailgated by a 1500 kg caravan)
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#5 Old 01-04-2013, 02:44 PM
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K&N filters

I've used K & N filters on 300TDI Land Rovers with increased MPG and more responsive engine. They are very efficient due to the oiled filter material. When you service them the dirt that is trapped is equal to a dry filter!

If it ain't bust don't fix it!
Think first then use a big hammer. If it won't move hit it harder!
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#6 Old 01-04-2013, 04:33 PM
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Nothing in your post about year, model, engine and drivetrain but anyway.
To the octane comment, don't bother. You'll never recoupe the cost differental especially here in Quebec (or Ontario for that matter). These things were not optimized for 91 octane.
As far as the filter goes, all of the aftermarket filters promise something but rarely deliver. The advantage of the drop in K&N filter, for day to day driving, is reusability and that's about it. The down side to a K&N is if you over oil it you risk coating the IAT sensor.
Now, the question about open source tuning is interesting because this is the one place where a difference can be made. On my 300C I have a tune for performance using 91 octane, CAI and modified open exhaust. I have another tune I occasionaly use for long hauls of 8 hours or more. It's set up for using 87 octane and is far, far away from a performance tune. The difference in fuel consumption is quite something.
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#7 Old 01-04-2013, 10:55 PM
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The things that have helped me save fuel are the following from best results to lower results

1.Low rolling resistance tires...currently using Michelin
2.Synthetic oil
3.Keeping fuel injectors clean with treatment twice a year
4.Not carrying around excess weight in the car
5.Correct wheel alignment

Higher octane gas never made any difference.
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#8 Old 01-04-2013, 11:12 PM
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Hypermiling is the best way, outside of proper maint. It takes getting used to, and you'll spend more time in the right lane, but it works. Also, turn off your engine if your going to be stopped more than a couple of min, such as waiting for a train to pass, that saves a little. Your going to coast alot to stops, as well as speed up very slowly. Don't warm up your car for more than half a min, cold engines drink fuel. If you live in a cold climate, a engine block heater really helps.
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#9 Old 01-07-2013, 09:14 AM
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Originally Posted by Montreal300 View Post
Nothing in your post about year, model, engine and drivetrain but anyway.
To the octane comment, don't bother. You'll never recoupe the cost differental especially here in Quebec (or Ontario for that matter). These things were not optimized for 91 octane.
As far as the filter goes, all of the aftermarket filters promise something but rarely deliver. The advantage of the drop in K&N filter, for day to day driving, is reusability and that's about it. The down side to a K&N is if you over oil it you risk coating the IAT sensor.
Now, the question about open source tuning is interesting because this is the one place where a difference can be made. On my 300C I have a tune for performance using 91 octane, CAI and modified open exhaust. I have another tune I occasionaly use for long hauls of 8 hours or more. It's set up for using 87 octane and is far, far away from a performance tune. The difference in fuel consumption is quite something.
Sorry, should have specified, I have a 2012 Santa FE GL V6 AWD.

I am aware of the risks if I over oil the filter. Though I have one on my STI and am pretty used to how much oil is required as to not over saturate them. But the savings might only be in the actually reusability.

For the tuning, I really think it's a viable option, only issue is finding a qualified tuner, someone that knows Huyndai. As like most tuners, they only usually work on a specific brand of car. I had ask my Subaru tuner, but he only touches Subaru.
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#10 Old 01-07-2013, 11:45 AM
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The only 'tuning' (e.g., remapping of tables) that has been shown to have a positive benefit on a Santa Fe has been on the diesel engines.

K&N might buy you a couple of HP at the top end, but not mileage.

Even if the engine were to allow a more aggressive advance curve against the knock sensors with higher octane gas, you'd never begin to recoup the difference in price. Further, what you'd get back (like the K&N) might be a couple of HP at the top end.

What hasn't been mentioned (only obliquely by austex) is that accelerating a +/- 4000# vehicle takes quite a bit of fuel, and as a result, your enemy is your brake pedal. Anticipate as much as you can the need for braking. There's no point in wasting perfectly good fuel to keep your brake pads heated up, and it can eat up an astonishing amount of fuel.
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