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Hypermiling the 2013 RX 350 = 40ish mpg

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Old 01-24-14, 07:17 PM   #16
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Originally Posted by markrivers View Post
Hi guys!

i got a little bit bored this 3 day weekend,
so i have decided to do what my " Prius" friends are doing with their cars. Hypermile.

Basically, they put a lot of air on their Low Rolling Resistance Tires for better mpgs.
most do 45, while i know some who puts 60psi.

Hmm.. so let's test that on a 2013 RX 350 running on regular unleaded 87 octane ( Costco gas) with OEM tires ( Dunlop Grandtek) and 19 inch rims.
every gauge was reset to ZERO
trip A
average mpg
average speed

here's my baseline: i do 85% highway and 15 % city driving.

and here's what happened after putting 38psi ( too scared to do 40)

and nearing the end of my commute

and at here's the final

Disclaimer: i don't recommend this practice at all.
Overinflating the tires can give you a lot of mpgs but it can be unsafe
Although, aside from a bumpier ride, i didn't feel any difference in the drive.
i can easily replicate those numbers without doing anything at all, tire pressure, driving habits etc....2010 RX350 with costco regular unleaded, .in my opinion the only way to get acurate fuel consumption is start with empty tank and calculate manually. just my 0.2 cents

Last edited by vince22; 01-24-14 at 07:20 PM.
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Old 01-24-14, 07:31 PM   #17
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Originally Posted by fastnoypi View Post
The max inflation on the sidewall is a safety max at cold tire pressure prior to bursting concerns that can be caused by bumps and road hazards once the tire air warms up.

Exceeding past the manufacturer's max load cold tire pressure recommendation will lead to a smaller contact patch with excessive wear in the center of your tire . It will affect handling characteristics and braking distance which is unsafe. You're compounding the risk of a blowout being in a heavy SUV.

Not worth the risk to the safety of yourself, passengers and others on the road, just to save on a few gallons of gas IMO.

Even if you doubled your fuel economy for the life of the car (lets say 10 years), which at 12,000 miles per year with a base fuel economy of 25 mpgs, you are saving about $1500 per year with an average gas price in the low $3s. Double the rate at which you have to replace tires because of excessive wear in the middle which we will assume will cost you $1000 every 2 years and the net amount saved is around $10,000.

So is $1,000 per year over 10 years worth a horribly bumpy ride and extreme safety risks to your family and friends? If you want to take risks go throw that $1,000 into the VIX - today you would have profited nicely!
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Old 02-09-14, 01:17 AM   #18
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I have noticed that using the cruise control lever to accelerate and slow down seems to give better mileage as per the dashboard graph than manually accelerating or braking. I am referring to use of "cancel" and "resume" on the lever. Does anyone else concur? One concern I have is whether engaging and disengaging the lever so often will negatively affect its life.

Last edited by elba123; 02-09-14 at 01:24 AM.
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Old 02-09-14, 05:01 AM   #19
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I've been doing that for years on several cars and never had any issues because of it...
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