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Discussion Starter #1
A friend of mine is looking into maximizing MPG and asked what I would do and I immediately suggested lighter wheels - back of the envelope math says for every 1 pound removed from the wheels and tires a gain of approximately .09% in acceleration and perhaps MPG, roughly. This would be for a 2WD HRV based on factory HP and weight.

To put that in perspective the OEM 17 inch wheels weigh 109 pounds total (27.25 x 4) while the OEM tires add another 92 pounds for a total of 201 pounds.

Simply replacing the wheels with Enkei RPF1 17x7 you could shed 50 pounds of wheel weight (14.9 each x 4) - that should equate to roughly a 4.5% decrease in 0-60 and increase in MPG - if you get 36 all highway - that would become 38 maybe 39 - If you stepped down to a 205 DWS all season sport tire and did titanium lug nuts you could shed another 10 pounds and gain a slight advantage in gearing while reducing the contact patch .5 which would net 5.4% maybe 6-7% depending on how you actually drive, cruise control, terrain etc. Needless to say 7% is pretty good but the tires, wheels, lugs minus your old wheels resale is still 1400 ish - If you drive 20,000 miles a year at 36mpg and buy gas at 3.00 per gallon thats 1667 in yearly fuel costs - if your MPG jumped to 40 even, you are only going to save 167 per year, it will take 8 years to make that back if all you care about is MPG - thought the acceleration and ride quality will also improve.

So I started looking around for something cheaper and thought of the Tesla Model 3 wheels and tires - I have been able to find take offs for as little as 600 for 4 with tires etc. The specs for wheels and tires vs the HRV are below, needless to say they are close however they arent as light as the RPf1's but if you sell your factory wheels they could be free at that price.

The wheels are 21.5 each so basically 6 pounds but the tires are a more advanced version of the same tires the HRV has and are 2 pounds heavier so the net is 4 pounds each or 16 pounds total. for a gain of about 1.44% but the wheels covers which and 6 pounds total (now .9% gain) also improved range by around 4% and as a bonus for HRV owners, dramatically reduce wind noise on top of the acoustic tuning of the OEM tires.

The combination of wheels, tires and aero covers could be as much as 5% in steady state for essentially 0 dollars invested with stock wheels resale but may be capable of much more based on stories of actual use from owners.

There is still the option of using Ti lug nuts to reduce 2 pounds and you could step down to a 225 45 18 which is .3 smaller than OEM but sheds another 8 pounds - Another and final issue is of course that they will be Hella Flush with a 27mm wider fitment however based on prior experience a wheel specialist could change the offset from +40 to +60 safely which would make them obviously 5mm wider, negligible.

This is something he is pursuing including changes to the ride height, tire pressure and alignment settings so I am not sure if I can get exact figures in practice but these were my best estimates.

Since he drives 80K a year for work and is reimbursed for mileage at a rate equivalent to 3.00 per gallon, 20mpg - the amount of money involved is significant, we may be able to reduce fuel consumption to the point he can buy a new used HRV every 2 years for free, since he doesn't expect them to last 3 maybe 4 at that mileage every year.

30600






30599
 

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Honda did that with their old HX Civics. Their wheels are lighter and low rolling resistance tires.
 

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Would the savings offset the 4 new wheels, and 4 new tires and 25 new lugs etc ? Plus labor for mounting and disposal fees etc. ?
Probably not worth it this way -
BUT if the factory offered these options form the get go - there would be an "overall savings".
 

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Honda did that with their old HX Civics.
I think you meant "HF" models.

I agree, prob not worth the cost tho'. (Kind of like, paying $7000 more for a Hybrid car?)

That said, when I was working I found that just driving with mild Hypermiling techniques saved about 8% in fuel cost.
 

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@Carbuff2 I agree that just a little change in driving is already just as much change in mpg
 

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I think you meant "HF" models.

I agree, prob not worth the cost tho'. (Kind of like, paying $7000 more for a Hybrid car?)

That said, when I was working I found that just driving with mild Hypermiling techniques saved about 8% in fuel cost.
The wheels on some of the Civics from the late 1990s and early 2000s was the HX. They are 14" and weigh about 12 lbs each. I scored a set for my Del Sol last summer.
 

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This got me thinking... There are plenty of wheels at around 20lbs each and costing around $500 installed, it is still a 10 year payback. Don't think I can sell that to the boss. Let's see, I sell the current wheels for $100, then it takes it down a little further... hmmm... nope, still just a I love the earth argument... Darn... Going to have to find some other excuse to buy new wheels.
 

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I struggle at times with limits and want new wheels, not because they are lighter than the originals; I just want some other OEM wheels that I think look better on my HRV.
 

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Discussion Starter #9
It seems like the factory wheels and tires can sell for 600 and the Model 3 takeoffs go between 6-800 so it could be 0 cost to 200. If you have a machinist adjust the backspacing for 25-40 per wheel. As soon as I drop 1/2 tank of gas and get it aligned I will check the MPG with the taller tires.

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Too much beer consumed over the years for me to remember exactly HF vs HX. :rolleyes:
:LOL:

Anybody looked it up?
 
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