RX - 1st Gen (1999-2003) Discussion topics related to the 1999 -2003 RX300 models

how many miles do you get on a full tank?

Old 10-09-11, 09:27 AM
  #16  
hypervish
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Originally Posted by Lexmex
When I get some time later this week, but I plan to do some maintenance on my vehicle to hopefully bump it up over 20+ mpg, it's 19.6 last time I checked, but on the highway, been getting 24 to 27 mpg on longer trips across Florida. When I have taken trips out of state, get much better gas mileage with non-ethanol gas in other states.
Wow, 24-27 mpg. How fast do you drive (on longer trips...LOL)?
I've been able to get 25 once, but I was driving the speed limit (65) = no fun. Usually I get 23-24mpg, which isn't bad considering newer suv's can barely yield that much (non-hybrids).
Old 10-09-11, 09:31 AM
  #17  
Lexmex
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Originally Posted by hypervish
Wow, 24-27 mpg. How fast do you drive (on longer trips...LOL)?
I've been able to get 25 once, but I was driving the speed limit (65) = no fun. Usually I get 23-24mpg, which isn't bad considering newer suv's can barely yield that much (non-hybrids).
It's not so much how fast I drive, but if I use either cruise control or more often keeping my foot constant on the accelerator. When I came back from Mexico to Florida (via Texas, Louisiana, Mississippi, Alabama), I was getting 27+ with a full load and my father and all my belongings.
Old 10-09-11, 11:57 AM
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mckellyb
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Originally Posted by Lexmex
It's not so much how fast I drive, but if I use either cruise control or more often keeping my foot constant on the accelerator. When I came back from Mexico to Florida (via Texas, Louisiana, Mississippi, Alabama), I was getting 27+ with a full load and my father and all my belongings.
Constant throttle opening is essential to high MPG!

Lower speed helps, to a point, but my wife following me while I was driving the 40' diesel-pusher motorhome, think 0-60 in less than a minute, but just barely less, was getting 31-32 MPG for multiple tanks.

Top speed of about 60, and for an automobile, barely noticeable acceleration forces. This was from Vegas to Denver, BTW, not exactly the flatlands.
Old 10-09-11, 05:33 PM
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AlexusAnja
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147K miles on engine, 87 regular now since I was getting chump mileage using 93, and I'm getting about 14 mpg all local and lucky to get 20 highway doing 70 mph with cruise. The RX has been reduced to short trips to market and bring kids around for sports.
Old 10-15-11, 11:28 PM
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NyCrAzY
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My tires are bad and alignment is a problem for me. Planning to replace with new tires and get the alignment next week. Could that be causing me getting 12-14 mpg in city?
Old 10-16-11, 09:48 AM
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Lexmex
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Originally Posted by NyCrAzY
My tires are bad and alignment is a problem for me. Planning to replace with new tires and get the alignment next week. Could that be causing me getting 12-14 mpg in city?
Alignment, balancing, rotation can affect MPG, but usually not a huge amount.

Keep in mind, that with new tires (given they weigh more than the old tires you had), you will likely not notice an MPG change, and generally a slight drop off. Just the principle involving rotational mass.
Old 10-16-11, 04:06 PM
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Originally Posted by Lexmex
Alignment, balancing, rotation can affect MPG, but usually not a huge amount.

Keep in mind, that with new tires (given they weigh more than the old tires you had), you will likely not notice an MPG change, and generally a slight drop off. Just the principle involving rotational mass.
Then what could my problem be Lexmex? This is a 1999 RX300 with 176,000 miles on it.

Only problems I've experienced since I bought it -
  • new set of four tires
  • my allignment is off, but I'm getting that fixed with the tire change.
  • Each time I hit a bump, my RX300 makes a rattling noise. (Around the tires I think?) Something sounds loose each time I hit a bump.

That's all I can think of. I've been doing all my oil changes on time, I don't drive aggressive. I get 19 mpg on my dads Nissan Murano so yeah.

A full tank only gets me 180 - 210 miles ... which is unacceptable. So I don't know what else could be causing it.
Old 10-17-11, 07:13 AM
  #23  
Lexmex
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Originally Posted by NyCrAzY
Then what could my problem be Lexmex? This is a 1999 RX300 with 176,000 miles on it.

Only problems I've experienced since I bought it -
  • new set of four tires
  • my allignment is off, but I'm getting that fixed with the tire change.
  • Each time I hit a bump, my RX300 makes a rattling noise. (Around the tires I think?) Something sounds loose each time I hit a bump.

That's all I can think of. I've been doing all my oil changes on time, I don't drive aggressive. I get 19 mpg on my dads Nissan Murano so yeah.

A full tank only gets me 180 - 210 miles ... which is unacceptable. So I don't know what else could be causing it.
How fast are you going when you are hitting these bumps?

Slow speed and rattling usually is a shock/shock mount issue, but there's a whole bunch of clicks/rattles that I know of.

When you get your tires changed, pull your battery cables and let the vehicle reset and just drive normally. We'll get a better idea then if its something out of whack with suspension/alignment.
Old 02-21-12, 08:51 AM
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NyCrAzY
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Thought id update this.

Im still getting 200 miles on a full tank. Averaging 13-15mpg still.

Got new tires and all fluids done. Still no difference..
Old 02-21-12, 10:33 AM
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lexus114
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Originally Posted by NyCrAzY
Thought id update this.

Im still getting 200 miles on a full tank. Averaging 13-15mpg still.

Got new tires and all fluids done. Still no difference..



Your going to be hurting with these gas prices climbing.
Old 02-21-12, 08:21 PM
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takaiguchi
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I'm getting a little over 200 as well. When it gets warmer, I'm going to do plugs and cleaning the diff sensors and see how that goes.
Old 02-22-12, 03:36 AM
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hypervish
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I'm getting 230 miles in 100% city with the smaller tank on the 00'. But, I warm up the RX 5 minutes every morning. And, it's on winter blended fuel right now. The MPG should start going up starting next month, as the weather becomes warmer, and as the transition to summer gas occurs.

Last edited by hypervish; 02-22-12 at 12:16 PM.
Old 02-22-12, 05:54 AM
  #28  
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On the highway, I get 350 give or take a little bit. That's high because when I drive on the highway, I set the cruise at 65 and let the car manage the speed.
Old 02-22-12, 07:18 AM
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thomas1
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dI remember Mine would only get around 250 on the road...Small tank in the 99 RX
Old 02-22-12, 03:17 PM
  #30  
OrdieJ
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2000 RX300 87 octane Mobil 1 oil 193,000 miles
City driving
Get about 220 to 240 miles before the light comes on.

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