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Rx300 Gas Mileage


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I am getting about 19 MPG on my 99 RX300...about 76,000 miles....98% of the miles are highway. I use regular unleaded, have recently changed the spark plugs & air filter. Is this about what everyone else is getting...better or worse? Is there anything that I can do to get a little better gas mileage? When we got it it was getting around 21 - 23 MPG but has dropped off in the past year or so. Thanks in advance for the advice!

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Ok, I'm in the middle of you guys. I've got a 2001 RX with almost 60K

(had them do my 60K service before I bought it). I'm getting about 18mpg

but most of my driving in local. And yes, Doug, you should see somewhat

of a boost in your mileage after they replace the O2 sensors. Maybe not

a lot, but some at least. The other thing that might be interesting is your

quality of gasoline. I don't use high-octane, but I do use either Mobil, or

Sunoco, or one of those v.s. an off-brand. Tried using one of those cheaper

brands, and unfortunately it only took a tank or so, I found my climb over

the local mountain seemed less energetic.


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The Toyota Highlander shares the same V6 engine as the RX300:

Here's a Highlander owner testimonial about the effect of octane on gas mileage:

Subject: Re: [Toyota Highlander Club] Fuel: change from Premium

to Regular

Date: Tue, 27 Apr 2004 20:28:23 -0700 (PDT)

From: planojoe <>


I notice a degradation of performance and gas mileage in

my 2002 V6 (with 41000 miles) when I use regular (87)

vs. premium (92). With higher prices, I switched to

87 and routinely got 1.5 to 2 mpg less than with 92.

Performance suffers as well. After refilling with 92,

performance improved and I'm back to 20-22 mpg in

mixed city/highway driving in Charlotte NC.

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Hey monarch,

Interesting info from ToyotaHighlander Group. If the price does go down,

I might try it again. Unfortunately, I think when I ran a couple of tanks of 93

octane, I didn't give it enough time to change. But, certainly, thanxs for

the imput.


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