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Acura RDX Real World MPG

189 messages,  Last post on Nov 08, 2009 at 3:44 PM

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What is this discussion about? Acura RDX, Fuel Efficiency (MPG), SUV

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#176 of 189 Very low mpg by luckygirl25 Jun 27, 2008 (11:32 am)
I'm getting very poor results on the RDX. With conservative driving (minimal turbo kicking in) I'm getting about 14.8mpg. With more aggressive driving and turbo kicking in more often its 10.8-11.4 mpg. This is a 4 cylinder car, not a hummer or escalade! Every time I look at the gas gauge I cant believe how quickly it goes. I only do city driving, so it is all stop & go, and short trips. But I never got above 15mpg. Replies to this message: johnny98 (Jun 27, 2008 11:52 am) ubercheap (Jul 16, 2008 12:50 pm) luckygirl25 (Aug 15, 2008 6:09 am)
#177 of 189 Re: Very low mpg [luckygirl25] by johnny98 Jun 27, 2008 (11:52 am)
Replying to: luckygirl25 (Jun 27, 2008 11:32 am) 15mpg with minimal use of the turbo is really terrible. Is this on the highway or on stop-and-go city streets? I regularly get 24mpg or more on long distance highway trips. Half-city and half-highway is around 20mpg. If you're getting much less than 20mph on the highway, I would get the car checked out. Obviously, you're going to get much lower gas mileage at slow speeds with lots of cold starts. Replies to this message: ubercheap (Jul 16, 2008 12:50 pm) luckygirl25 (Aug 15, 2008 6:09 am)
#178 of 189 Re: Very low mpg [johnny98] by ubercheap Jul 16, 2008 (12:50 pm)
Replying to: johnny98 (Jun 27, 2008 11:52 am) Driving an '07 RDX with about 8K miles. Trip through NY, PA, MD with a lot of highway but with a fair amount small speed-trap towns and 2-lane roads and hills. Driving mainly gently with a lot of cruise control, but I'm not a hypermiler and I'm willing to spool up the turbo to climb hills and pass dunces.   Result" I got 25+ out of the first tank and 26.5 out of the second. Pumping the tires to about 40psi was the only thing I really did for trip prep. This might be the point where I really started to love the RDX again.
#179 of 189 Re: Very low mpg [johnny98] by luckygirl25 Aug 15, 2008 (6:09 am)
Replying to: johnny98 (Jun 27, 2008 11:52 am) Its all city driving, like stated, so its stop & go every couple blocks. I did take it to the dealer, and they said its "normal" to have variances between sticker and actual due to the way you drive. Of course it is, but I have an RDX and not a hummer, so these poor results are ticking me off. I wouldn't have gotten such a small SUV had I known it was such a gas guzzler. I was in my friends Mercedes ML350, and I saw her monitor display 17.9mpg. I was astonished. We drive the same places, same city driving, and she's getting much much better mileage on a 6 cylinder much heavier SUV. I got this nice turbo that is sucking me dry. If you guys would buy again, would you get the RDX due to this mileage trouble?
#180 of 189 20 by dep Aug 19, 2008 (9:43 am)
We are getting 20mpg after 500 miles in 50/50 stop and go + 70mph express way driving.
#181 of 189 2008 RDX - 24.0 mpg highway by sciguy Jan 03, 2009 (11:19 am)
On 9/20/08 I got 24.0 mpg on a 134 mile trip from Irvine, CA to Santa Barbara at an average speed of 67 mph. Light traffic, little or no wind, 3 adults, overnight luggage, roof rack, but nothing on it. All numbers from the trip computer. This car was purchased Dec 2008 and had about 8000 mi on the odometer at the time. My only real complaint about this car is the quirky voice recognition system in the Tech package.
#182 of 189 Recent MPG by novice Jan 04, 2009 (9:10 pm)
I have a new 2008 RDX, base (owned for 3 weeks). It's Black/Black and shines up beautifully (using Klasse). Early mpg says 24 plus on the highway. 15 plus exclusively stop and go local driving. I expect that once it has 10,000 miles on it, mpg will be slightly better by then. Other than the not-so-great mpg, this car is fabulous, and I view the mpg as one small compromise in exchange for a great drive.
#183 of 189 2007 RDX mileage at 8000 mi by dgorrell Mar 11, 2009 (4:59 pm)
On a recent trip between Park City, UT and Sun Valley, ID on mostly (80%) freeway at 75-80 (75 speed limit) my mileage was 23.7 by hand and 22.8 on the tech computer. I use the paddle shifters for almost all deceleration, used no A/C with windows closed and do not do any special tricks to enhance mileage. Fuel used is 91 octane.
#184 of 189 Re: 15.9 mpg on my new RDX 1st tank [woodyww] by wwest Apr 01, 2009 (4:43 pm)
Replying to: woodyww (Apr 12, 2007 10:50 am) Putting a smallish 4 cyl. in the RDX isn't so much the problem as is the fact that it is turbocharged. A normally aspirated engine would have a compression ratio of 10:1, 12:1 with DFI in the CX-7. In order to "accomodate" the dynamic increase in CR with turbo boost the base engine CR must be derated from the norm.   Since most of the time you spend driving the RDX you are off-boost you are sacrificing a serious level of FE improvement for the rare and brief periods of "on-boost" acceleration.   Mill the engine head to raise the CR to the "standard" of 10:1 and "wire" the turbo wastegate fully open and you will likely see an FE improvement in the range of 30-50%   Or even better use VVT-i to dynamically change the CR from Atkinson cycle mode for cruising but into the Miller cycle as boost rises.   So much for TURBOCHARGING...!! Replies to this message: Firebird_EOU (Apr 07, 2009 6:15 pm)
#185 of 189 so to save gas you should accelerate as fast as you can to 60mph? by Firebird_EOU Apr 07, 2009 (6:15 pm)
Replying to: wwest (Apr 01, 2009 4:43 pm) then coast from there? The traditional ease the pedal acceleration won't save gas?

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