07 RTS with a tad under 11,000 miles. Driving is 65% highway...
When new, truck got 15 mpg. That number slowly improved and peaked at about 17.5 mpg at 8000 miles. Since then it seems to be getting worse and worse. last fill up was 15.6 mpg. It seems like the highway economy is not getting much worse but the slow speed local economy is way down. At first I though it was related to the hot summer and AC use but it's gotten a lot cooler in NY so that is not the issue. I still feel that "gee the tranny is in the wrong gear at low speed" sensation that the dealer says is normal and the ROC folks attribute to Grade Control Logic.
Has anyone learned anything new about the Grade Control logic or other possible causes of deteriorating fuel economy.
The good news is gas is $2.26 and not the 4+ bucks it was in the spring.

Happy Holidays to all.

I have just about the same mileage and have noticed a slight decrease in mileage the past couple of weeks. I was figuring it was related to the winter fuel with the higher ethanol levels (have noticed the same thing with other vehicles in the past). Since you're in the northern part of the country maybe its the same thing.

You definitely get lower fuel economy with the winter fuel. Where do you live that gas is $2.26 a gallon? Is that high test?

Thats the regular price. It actually is down to $2.19 this morning in Brooklyn ,New York. I filled up yesterday in NJ. That was $1.65 gal.

NYC traffic & fuel economy do not mix no matter light on the throttle you are

Kid,
It is in fact the winter fuel. Our economy is about the same, as is our mileage. The winter fuel usually hits our area in November.

Do you park your truck outside overnight? Longer warmup times use more fuel.

Fuel mileage should go up with increased miles, not down. My average non-towing mpg (tanks of gas with no towing involved) from 16.71 at 9,000 miles to 18.95 at 39,000 miles. As if Sept. 1, all fuel in Oregon must be E10 year round, but so far I have not noticed a significant drop in mpg.

SPeaking of fuel mileage I have a question. Are you guys manually calculating your MPG? I just bought used 2006 ridgeline tonight, I havent had a chance to look over the manual. However I kept trying to find out where it told me the MPG. Does the 2006 Ridgeline not give you an electronic reading of the MPG? Sorry if I am just lost but I havent had a lot of time to play with the vehicle or read the manual.

Does the 2006 Ridgeline not give you an electronic reading of the MPG? Sorry if I am just lost but I havent had a lot of time to play with the vehicle or read the manual.nope, a scangauge is available which provides that info among many other bits of neat info.

Scanguage. I have had two 2007 Tahoes, a 2007 Silverado, and a 2007 Escalade. Getting my first Honda has been a learning experience. I was/am a moderator at chevroletforum.com and have a quite a bit of knowlege on the GMT900 vehicles. But wow, I have a lot to learn in the Honda world.

I actually was reading the manual when I got this message and realized that it indeed doesnt provide you with the fuel mileage. That is very shocking. I havent had a vehicle in 10 years that hasnt had this feature. Oh well, not a huge deal. My first drive/ride in a ridgeline was tonight after I had handed the guy a check. I have to admit, driving it home was exciting. I am happily surprised with the ride and drive quality.

Thanks for the quick reply. I have tons of questions so please bear with me in my learning process.

SPeaking of fuel mileage I have a question. Are you guys manually calculating your MPG? I just bought used 2006 ridgeline tonight, I havent had a chance to look over the manual. However I kept trying to find out where it told me the MPG. Does the 2006 Ridgeline not give you an electronic reading of the MPG? Sorry if I am just lost but I havent had a lot of time to play with the vehicle or read the manual.
Not taking away from technology, but start with the old school method.

1) top off your tank and reset your trip odometer.
2) Drive until it's time to fill up again.
3) top off your tank and divide the number of miles driven by the gallons it took.

While it's never going to be exact (because of being off +/- .5 gallon filled), over time it will give you a good all around number to use.

Not taking away from technology, but start with the old school method.

1) top off your tank and reset your trip odometer.
2) Drive until it's time to fill up again.
3) top off your tank and divide the number of miles driven by the gallons it took.

While it's never going to be exact (because of being off +/- .5 gallon filled), over time it will give you a good all around number to use.

Speaking of technology, just how accurate are those trip computers that come on many vehicles these days? Anyone ever run a manual check against the trip computer and see if there's any discrepancy?

We've been driving Hondas and Toyotas for the last 12 years or so and have not had a vehicle with a trip computer.

I did on my G35 and it was within 10%...one of us was wrong, but not by much.

Thanks for the reply. It was just a shock that a vehicle loaded up with Navigation didnt have a trip computer. Not a huge issue, just a surprise.

I have no problem calculating it the manual way, just wondered if there was something I was missing on the vehicles information system that calculated it for you. Thanks again for the information.

Are you guys manually calculating your MPG?
I have a Scanguage which I refer to when driving, but for accurate overall mileage I do it manually and keep a running average on a spreadsheet. Fuel mileage on a tank to tank basis is not very accurate due to the variances of fuel pump shut off valves. I don't top up because it's the wrong thing to do with today's fuel systems.

Looking into the scangauge now. Do you have the scangauge II? Where do you have it mounted. I saw some pics of the scanguage mounted on the rear view mirror, i wondered how that looked in person.

the old school method.

1) top off your tank and reset your trip odometer.
2) Drive until it's time to fill up again.
3) top off your tank and divide the number of miles driven by the gallons it took.

While it's never going to be exact (because of being off +/- .5 gallon filled), over time it will give you a good all around number to use.

im keeping it old school son!

I keep a calculator in teh 'not an ashtray' and check it every time I fill up. the last few tanks I have also noticed it go from 18mpg down to 16mpg with no change in driving...

im keeping it old school son!

I keep a calculator in teh 'not an ashtray' and check it every time I fill up. the last few tanks I have also noticed it go from 18mpg down to 16mpg with no change in driving...

Winta Blend...

IMHO, it's not just winter fuel that causes the gas mileage to go down. I showed this graphic to my Honda service tech at my 15,000 mile service and he made note of it, but couldn't explain it. I tow my 3000lb boat every other weekend or so during the summer months, but it gets put into storage in October and doesn't jive with the decrease in mileage. Something caused the mileage to drop in late August - September and it hasn't recovered. I was optimistic that the average mpg was going up through 10,000 miles, but now I'm not so sure. I think this is a phenomenon that needs further investigation.

There are a lot of variables that will effect the mileage on your RL. I have kept pretty good records of my mileage and my mileage ALWAYS goes in the crapper in cold weather. I bought my RL in Nov. of '05, the weather was cold, and winter gas was already hitting the stations and, no matter what I did, I could not get better than 16.5 MPG. Didn't matter if a tank was mostly highway, city, or whatever. I could not get better than 16.5.

As soon as the weather started warming up, my mileage started getting better. It was nothing for me to get 18+ MPG in regular, day-to-day driving. It was not unusual for me to get over 21 MPG on the highway.

As of late, I was getting almost 22 MPG on regular day-to-day driving. As soon as the weather got cold, my mileage has really gone in the crapper again..down around 18 MPG in regular driving.

I think the RL is very "sensitive" to winter gas and cold temps; at least that is what I have noticed. Ddoesn't matter what you do, your mileage is gonna suffer in the winter/during cold temps.