Last post on Jul 22, 2010 at 9:24 AM
You are in the Acura RDX
What is this discussion about?
Acura RDX, SUV
#36 of 55 Re: 2008 Acura RDX - Gas mileage [ngauthie4]
Apr 26, 2009 (9:48 am)
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]
Apr 26, 2009 (9:56 am)
Has anyone tried "wiring" the wastegate fully open to determine the FE improvement..??
#38 of 55 Re: 2008 Acura RDX - Gas mileage [wwest]
Apr 27, 2009 (9:40 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]
Apr 27, 2009 (9:47 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]
Jun 04, 2009 (9:55 am)
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!
Aug 02, 2009 (9:59 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.
Sep 02, 2009 (6:16 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.
Sep 02, 2009 (4:49 pm)
Just came back from 300 mile trip avg 24.5mpg per computer with mostly highway 75mph w/AC - 2 adults. Normal in-town driving is 20mpg.
#44 of 55 Re: 2009 RDX mpg [Firebird_EOU]
Sep 10, 2009 (10:05 am)
Drop the turbo and adapt the engine to DFI, 12:1 compression ratio, and the hwy FE would probably rise to ~30 MPG.
Or even use Toyota's new HSD extended VVT-i technique to transition the engine from "Otto" mode into Miller cycle mode as the throttle opening rises. With the addition of DFI that would allow a 15:1 compression ratio for low engine loading, cruising, and transition to 10:1 to accumodate rising turbo boost with increasing throtte openings, acceleration or high enegine loads/loading.
35 MPG and 300HP.
#45 of 55 Re: 2009 RDX mpg [wwest]
Oct 05, 2009 (10:52 am)
What's wrong with you?
This isn't an 'engineer your own engine thread'
Or a 'WIRE your wastegate open forum'
Maybe you should spend some more time at your local community college, where
your ideas can be exploited.
Instead of suggesting people self destroy their $40,000 luxury vehicles!
Good luck to you wwest!
Stay away from open microwave ovens...