Making the Ioniq slippier

[Phase]

Originally Posted by aerohead

MOTORTREND didn't say if it was the larger wheels, or 15" Hybrid Blue Aero, wheels, with 195/65 R 15s, which have been mentioned elsewhere, along with the 'Aero wiper blades' on the SEL model.
As to Wayne's numbers, someone needs to perform independent verification of his claims.
EPA values are meaningless to us. We don't drive on a dynamometer.
And I have no idea how often a car's 'guess-o-meter' samples, refreshes, and can accurately portray actual instantaneous mpg at a given speed.
Only a complete energy balance can tell us what a vehicle is doing.

I believe Wayne’s numbers because I’m getting BETTERS THAN HIS NUMBERS at each speed increment

[aerohead]

If you went before a jury of Ph.D. aerodynamicists, do you think you could scientifically argue your case?
Your claims might be interpreted to be so 'remarkable', that, as they say, your 'evidence' would have to be likewise.
Ockham's razor.

[Phase]

Interesting air flow from dirt deposits

[Phase]

Well today I got 78 miles per gallon cruising at 80 miles per hour with a tail wind in eastern oregon

[aerohead]

Originally Posted by Phase

Well today I got 78 miles per gallon cruising at 80 miles per hour with a tail wind in eastern oregon

I ran the numbers on your car ( I'll waive the $110 fee ), and it looks like it tops out at 40.05-mpg @ 80-MPH, thermally-equilibrated, with 'Standard Air, on a straight, level, smooth, dry highway, at sea level, on a calm day.
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In order to achieve 78-mpg would require a drag coefficient of Cd 0.0438, which cannot exist within our universe.
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* By itself, you would need a 33.4-MPH tailwind to achieve 78-mpg.
* Or the density-altitude coinciding with an air density of (rho)= 0.001360124538- slugs/ ft-cubed ( 0.6977461- kg/meter-sq. )[ There exist no highways on Earth high enough to experience an air density as low as required ].
* Or, some combination of tailwind, plus lower air density.
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In order to reduce the aerodynamic drag down to the Cd 0.0.0438 magnitude would require that you drive no more than 44.6-MPH.
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These are the cold hard facts of the matter.

[Phase]

I’m just stating what happened. Windy app said 12 mph tail wind and was around 4000 feet elevation in the eastern Oregon high desert. Overinflated low rolling resistance tires. Completely flat wheel covers taped up with no brake cooler. Rear wheel skirts. Double side mirror removal. Tapered box cavity fins. 100 percent grill block. I was barely having to touch the throttle and half the time would take foot off throttle for a few seconds here and there.

I’ve stated before that sometimes under very low engine load at high speeds, my hybrid does its own weird lean burn mode a lot and uses EV mode a lot more and then lightly will turn the engine back on to charge the battery and propel the car

Overall trip I drove from Beaverton Oregon to Boise Idaho on one tank of gas and still had 150 miles left over of range in my tank

[aerohead]

Originally Posted by Phase

I’m just stating what happened. Windy app said 12 mph tail wind and was around 4000 feet elevation in the eastern Oregon high desert. Overinflated low rolling resistance tires. Completely flat wheel covers taped up with no brake cooler. Rear wheel skirts. Double side mirror removal. Tapered box cavity fins. 100 percent grill block. I was barely having to touch the throttle and half the time would take foot off throttle for a few seconds here and there.

I’ve stated before that sometimes under very low engine load at high speeds, my hybrid does its own weird lean burn mode a lot and uses EV mode a lot more and then lightly will turn the engine back on to charge the battery and propel the car

Overall trip I drove from Beaverton Oregon to Boise Idaho on one tank of gas and still had 150 miles left over of range in my tank

I'm not disputing what you experienced.
And the information you've shared today would have been very valuable as a preamble to your original reporting.
With enough 'conditions' ( caveats ) we have a chance to 'reconstruct' a specific event on paper, and see if we can obtain a 'fit', knowing attributions of specific features captured in other reportings.
* tank capacity
* total amount of fuel consumed
* total round-trip distance
* total air density spectra
* total wind spectra
* total elevational changes
* mods
* etc..

[Phase]

No winds at all here in western Idaho. Completely dry vacuum outside. 81 mpg on interstate and getting still waaay above 40 mpg. My engine behaves differently in different conditions. It’s very odd. I wonder if Hyundai had kept the same hybrid drive train and engine transmission and just naturally lowered the cars drag to say .21 or something, the epa highway numbers would’ve skyrocket more than what basic calculators say. This pic was taken 10 min ago. Currently at Oregon stateline getting lunch

[aerohead]

I re-ran the numbers with these conditions :
1) the OEM configuration is good for 41.07-mpg.
2) the 100% grille-block, mirror delete, rear skirts, wheel covers, and burst edge extensions produce an estimated Cd 0.1820, good for 47.76-mpg.
3) adding a 12-mph tailwind produces 59.49-mpg.
4) adding the reduced air density of 4,000-foot elevation brings us to a maximum allowable 62.17-mpg.
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Somewhere, we've got to account for the missing 16-mpg.
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The eastern trip, from Beaverton to Boise is 438.5-miles, and almost exactly 5-hours and thirty- minutes., at 80-mph. A lot can happen to 'outdoor' conditions within the span of 5 1/2-hours.
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If you had '150-miles' left on the tank by the time you rolled into Boise, that means that your 'range', at 80-mph, was 588.5-miles to fuel exhaustion.
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588.5-miles, divided by 11.9-gallons fuel capacity = '49.45-mpg' *
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We need to reconcile the discrepancy between the 78-mpg reported by the ' G.O.M.', and the actual road trip range of 588.5-miles, which 'should' have been 928-miles to 'vapors.'

[Phase]

Originally Posted by aerohead

I re-ran the numbers with these conditions :
1) the OEM configuration is good for 41.07-mpg.
2) the 100% grille-block, mirror delete, rear skirts, wheel covers, and burst edge extensions produce an estimated Cd 0.1820, good for 47.76-mpg.
3) adding a 12-mph tailwind produces 59.49-mpg.
4) adding the reduced air density of 4,000-foot elevation brings us to a maximum allowable 62.17-mpg.
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Somewhere, we've got to account for the missing 16-mpg.
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The eastern trip, from Beaverton to Boise is 438.5-miles, and almost exactly 5-hours and thirty- minutes., at 80-mph. A lot can happen to 'outdoor' conditions within the span of 5 1/2-hours.
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If you had '150-miles' left on the tank by the time you rolled into Boise, that means that your 'range', at 80-mph, was 588.5-miles to fuel exhaustion.
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588.5-miles, divided by 11.9-gallons fuel capacity = '49.45-mpg' *
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We need to reconcile the discrepancy between the 78-mpg reported by the ' G.O.M.', and the actual road trip range of 588.5-miles, which 'should' have been 928-miles to 'vapors.'

The first half of the trip from Portland metro to eastern Oregon blue blue mountains was into a headwind. I was getting in the 40s for mpg that way, not to mention going up in elevation. The wind change direction once I made it over the mountain pass. When I did the trip in June with a slight tail wind the whole way, I got almost 700 miles of range out of the tank. The very high mpg I was getting the other day was only a short flat section from la grande to baker city Oregon. Can’t really track much with the mpg and all the mountain passes the rest of the way