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Acura RDX Fuel Efficiency Concerns

55 messages,  Last post on Jul 22, 2010 at 10:24 AM

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What is this discussion about? Acura RDX, SUV

Messages Page 5 of 7

#33 of 55 2008 Acura RDX - Gas mileage by ngauthie4

Apr 01, 2008 (3:44 pm)

I am getting horrible gas mileage on my 2008 RDX. Is anyone else experiencing the same thing. Two of my friends bought RDX's at the same time and they are getting 18-21 mpg. I am getting 13 mpg and I drive like grandma. I am mostly city, but so is one of my friends. We are going to swap cars for a few days and see if there is a difference.

#34 of 55 Re: 2008 Acura RDX - Gas mileage [ngauthie4] by angelina247

May 12, 2008 (10:08 pm)

Replying to: ngauthie4 (Apr 01, 2008 3:44 pm)
I don't know how many miles you had on your car when you first wrote, but I have had my car a few weeks now and am getting better mileage than I did in the beginning (17.1 city now). I was initially getting about 13 miles per gallon. I hear you should get better mileage after 600 miles or so. Also driving too slow will actually give you less gas mileage, especially in the beginning . Something about "blowing out the engine" which will increase gas mleage. I'm sure someone on the board can explain it better than I can.

#36 of 55 Re: 2008 Acura RDX - Gas mileage [ngauthie4] by mark4490

Apr 26, 2009 (10:48 am)

Replying to: ngauthie4 (Apr 01, 2008 3:44 pm)
I've only had my RDX for 3 weeks and I've only driven 1100 miles, but I'm getting ~20mpg. I think the other person that responded it right about not driving too slowly. A vehicle has it's maximum efficiency at a certain speed, say 60 mph. Go slower or faster and you're wasting gas.
 
When I'm going up mountains or steep hills (i.e., Mt Tam in Marin), the fuel economy drops to almost zero when I'm going too slow. So I give it gas more gas to speed-up and my fuel economy actually improves. The engine is doing having to do less work since the RDX is already moving. I generally punch the trottle/ goose the turbo to get moving and then back off when I get up to speed.
 
City driving reduces fuel economy dramatically. In my V6 Accord, I'd generally get 270 miles of city driving out of tank of gas vs 450 miles while on the highway.

#37 of 55 Re: 2008 Acura RDX - Gas mileage [mark4490] by wwest

Apr 26, 2009 (10:56 am)

Replying to: mark4490 (Apr 26, 2009 10:48 am)
Has anyone tried "wiring" the wastegate fully open to determine the FE improvement..??

#38 of 55 Re: 2008 Acura RDX - Gas mileage [wwest] by aellinsar

Apr 27, 2009 (10:40 am)

Replying to: wwest (Apr 26, 2009 10:56 am)
Have you, wwest? You have been posting that same line on every Acura message board for the past 3 years. Why don't you try it and post some results.

#39 of 55 Re: 2008 Acura RDX - Gas mileage [aellinsar] by wwest

Apr 27, 2009 (10:47 am)

Replying to: aellinsar (Apr 27, 2009 10:40 am)
Can't really afford to buy an RDX, or the CX-7, just to experiment. But should I decide to purchase then the CX-7 with DFI would be more likely. The DFI aspect would undoubtedly offer the most potential for FE improvment.
 
Surprising that the RDX doesn't have DFI, soon to come..??

#40 of 55 Re: MPG Test Drive [johnny98] by bgillette79

Jun 04, 2009 (10:55 am)

Replying to: johnny98 (Jul 22, 2007 4:50 pm)
Are you serious that you got 27mpg on the highway?
 
Was the TRIP COMPUTER reading or MANUAL calculation based on how much fuel you had to refuel with?
 
Hell...on flat highway at 75mph I'd be happy to see it get 24-25mpg!

#41 of 55 RDX Milage by 1bythesea

Aug 02, 2009 (10:59 am)

My '07 RDX with ~17000 miles on got 24.5 mpg driving 73 mph with the air running, on a mostly flat surface during a 700 mile round trip 95% highway last summer. Lately it has been averaging 20.9 with 50% city driving. Once summer is over, ethanol % is less, and resume to 30% city the mileage should return to average 22.5. These are all by the car readings, not by hand calculation.

#42 of 55 2008 RDX Mileage by mtairyordge

Sep 02, 2009 (7:16 am)

On a recent trip to North Myrtle Beach from Frederick Md (450 miles 17.5 gal got 25.7 MPG)
 
Yes this was manually calculated and I am positve about the number of gallons.
 
Mostly highway (I95) till Wilson NC where backroads takeover.
 
This was my driving.
 
Around town, which for us is rural Carrol/Howard county, my wife consistently gets 22.5 to 23 MPG. This is also manually calculated.

Messages Page 5 of 7

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