Last post on Jul 11, 2013 at 11:03 AM
You are in the Honda Accord
What is this discussion about?
Honda Accord, Fuel Efficiency (MPG)
#2529 of 2937 Re: MPG overall to date [blufz1]
Mar 20, 2009 (11:32 am)
Yep. My dealership has free state inspections. I have an appointment scheduled for next Friday for the inspection and a $1.99 tire rotation special.
I also told them that I want them to inspect the tires, shocks/struts, and the engine, while explaining the problems I'm experiencing with noise/vibration/mpg.
Did I mention that when I start my 1998 Accord and 2008 Accord side by side in the driveway that the 2008 Accord is approxmiately 300% LOUDER than my 1998? My 1998 is very quiet with little vibration, but makes lots of little clicking sounds. However, the 2008 is noisier than any car I've ever owned. We have a 2005 Odyssey that is very quiet also. But the 2008 is just the roughest sounding engine I've ever come across. I sure hope that there is something wrong with it that can be fixed and this isn't just the kind of Piece of Crap they are producing these days, because if the best they can do in 2008 is a noisy, rough riding, piss-poor gas mileage vehicle, then it may just be the last Honda (certainly the last Accord) that I'll ever own.
Can't wait until next Friday!!
Mar 23, 2009 (11:31 am)
Have not posted in a while, so here are some recent numbers for my 2007 I4 SE MT. Synthetic 0w-20, 40 psi, snow tires, gentle acceleration, coasting to stops.
Current 10 tank rolling average is 35.6 mpg calculated. (stayed above 30 this winter as my low was 30.1)
Lifetime average is moving back up with the temps and is currently at 33.72 over 57,300 miles.
Recent trip from SD to the UP of Michigan. Weather between 30 and 60 with some light winds and little rain. Mostly rural highways with speeds of 55 to 60 mph.
Tank 1 591.0 miles 13.01 gallons 45.4 mpg (43.8 scangauge)
Tank 2 611.3 miles 14.30 gallons 42.7 mpg (43.3 scangauge)
Tank 3 362.7 miles 9.43 gallons 38.5 mpg (40.8 scangauge) cooler - bit of rain
Congrats on 40 EZ - twice at that. I recently did a graph (exponential regression) of my 10 tanks averages and they show an increase in mpg over the two years I have owned the vehicle, so it was just a matter of time for you. In my experience mpg improves with age for the life of the vehicle, assuming the engine maintains compression. Gains taper off as the car gets older though.
I would guess that you see the same gain over 10 times the mileage. In other words if you gain 1 mpg after 1,000 miles you may see another mpg after 10,000 miles and yet another at 100,000 miles. At that point you would need a million miles to get much improvement so not too likely.
#2531 of 2937 Re: - [dudleyr]
Mar 23, 2009 (5:53 pm)
That's a very impressive milage.
i think 40 psi is overkilled...The rolling resistance may be decreased, but you get less traction and extra center wear on the tire.
07 Accord V6 auto average about 18mpg with 90% city/10%highway this winter (5W-20 Synthetic, X-ice winter tires 215/60R16 32PSI all around).
#2532 of 2937 Re: - [dudleyr]
Mar 24, 2009 (4:57 am)
....Congrats on 40 EZ - twice at that. I recently did a graph (exponential regression) of my 10 tanks averages and they show an increase in mpg over the two years I have owned the vehicle, so it was just a matter of time for you. In my experience mpg improves with age for the life of the vehicle, assuming the engine maintains compression. Gains taper off as the car gets older though.
........appreciate your words/insightful base 10 forecasts.....
The first 40+ tank was so high - - - I just had to try and re-validate. Anyway one looks at it, these cars put to rest the concept that performance AND economy are mutually exclusive.
I feel some what the traitor when I consider replacing the space soon to be vacated by my small sloop/trailer - - - - with a Miata. I reckon what I'm really saying is that my 6M perception sets the bar big time high.
hang in there, senor............
Mar 24, 2009 (6:34 am)
Regarding 40 psi.
Heat is a major contributor to tire wear, and heat is caused by the tire flexing as it rolls. More pressure means less flex and less heat. More pressure sometimes means that the sides wear more slowly than the center, but the center can still wear longer than lower pressure tires.
In my personal experience with the Accord - my tires wear evenly and I still have my original tires (about 30k on the bridgestone summers and a little less on the michelin x-ice winters) All 8 of my tires are at half wear or less so I expect to get about 120,000 miles total or about 60,000 miles per set.
As far as traction goes, greater pressure results in a stiffer sidewall, so the tire acts like it is a lower profile and does not roll over in turns and maintains its contact patch. One easy way to tell if a tire is underinflated is all the squeeling in turns because of the tire rolling on its side slightly.
Personal experience - the car handles more crisply with 40 psi and squeels less around turns. The body roll gets annoying way before tire grip is a problem.
The only real drawback to higher pressure (at least in the range I use) is a harsher ride, but the ride is still way smoother than my Integra so it is not a problem to me.
If you have never tried 40 psi give it a whirl - you can always go back if you don't like it, and it does help with mpg. Also remember to only check tire pressure when the tires are cold. Best way is to pump em up a little high and then drop the pressure to what you want the next morning after the car has sat all night.
btw - love the x-ice tires I have no problems with blizzards in the Dakotas and they are wearing extremely well - better than my summer tires. I have used blizzaks and yokohamas and the previous michelin (arctic alpin) and these are the best of the lot.
Mar 24, 2009 (2:13 pm)
Has any body tried that new Castol synthetic 5W- 20W in there car yet.
#2535 of 2937 Re: - [dudleyr]
Mar 25, 2009 (7:37 am)
I agree with the points you listed above.
Maybe you should aware that over-inflated tires make your car harder to stop. It's caused by less contact area and the front tires bounce.
#2536 of 2937 Re: Castrol Oil [packer3]
Mar 26, 2009 (11:00 am)
Packer, to your qestion, I'd say no; but... I have used Mobil1 at 5W-20 and really like it. My 08 EX L's mileage improved several miles per gallon (i didnt save the numbers). With the long oil change interval in the new Honda's synthetic's make sense. I've driven four cars and one truck over 100k using Mobil1 with nary an engine problem.
#2537 of 2937 Re: - [dudleyr]
Mar 26, 2009 (5:36 pm)
I still have my original tires (about 30k on the bridgestone summers
Interesting that yours came with Bridestones. Mine did as well. I know we've discussed that on Edmunds before but I can't remember if there was any particular reason. We both have manuals though... and great mileage. Hmmmm
It also sounds like those who have Michelins aren't too happy with them. Mine are at 65k and doing fine.
#2538 of 2937 EX V6: 28.8 MPG
Mar 29, 2009 (8:35 pm)
Car: 2004 Accord EX V6 sedan
Load: 2 people plus some light luggage
Tires: Yokohama W4S, 32/34 psi
During Valentines Day weekend my GF and I went to a little B&B just south of Morro Bay, CA. The round trip was 430 miles (95% highway, 5% city) on one tank of regular Costco gas (14.932 gallons).
We took I-101 to route 1 all the way down which was relatively slow and scenic. There were some sections where the road was clear and we could get some speed. Route 1 overlooks the Pacific coast so it has a lot of twists and elevation changes and we weren't going that fast (<50 mph max). Coming back we crossovered to I-101 via 41-E and then took 46-E to I-5 north where traffic was moving briskly (as usual). There was a lot of traffic (Sunday evening) so there was a lot of passing and darting in and around traffic. I'd say the average speed on the return was around 75 mph. The entire trip, though mostly the return, had a lot of heavy sustained acceleration (love the V6 power for passing!) and braking. We put 430 miles on the odometer and averaged an astounding 28.8 MPG!