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SUVs Honda Pilot Honda Pilot Real World MPG
981 messages, Last post on Oct 23, 2009 at 12:54 PM
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Replying to: badmpg1 (Nov 16, 2008 9:34 pm) I installed a Scan Gauge yeaterday. One of the functions is the water temperature. Didn't pay much attention to that, but will get back to you. Have you done the ILP? See page 11 of this forum. Kip
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Replying to: kipk (Nov 17, 2008 4:50 am)
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Replying to: badmpg1 (Nov 17, 2008 10:15 pm) Sooner or later the battery will run down, be disconnected for some reason, or need replacement. And something similar will need to be done. A few years back my local mileage dropped from 18+/- to 14+/- and the road mileage from 25+/- to 21+/-. After reading about the ILP it occurred to me that I had disconnected the battery while looking for a short/blown fuse just before the mileage got bad. The idle was fine, But I did it anyway. After doing the ILP, the good mileage returned. I had asked my Honda dealer service writer about the ILP and he said it was only for a smooth idle and would not affect mileage. The service manager said the same. That isn't the first time they have been wrong. If it was done correctly by the dealer, before you took delivery,and the battery has not been disconnected or died, doing it again will not do a thing for you. However It can't hurt either. If you should decide to do it, follow directions. It is an IDLE Learn Procedure. With this colder weather, I would turn off all accessories, disconnect the battery for 5 minutes. re connect the battery, crank the car and go back in the house for a half hour or so. Then go out and watch for the cooling fans to cycle twice. Go back in the house for 10 more minutes. Then go out and turn the engine off. Turn the switch to the run position for 2-5 seconds, then start the car. let it idle for a few seconds and you are done. If you missed a few fan cycles in that first half hour, that is ok. The key is that it needs to cycle those fans at least twice and idle 10 additional minutes. FWIW: My normal local driving usually involves round trips of 6-15 miles. My average MPG for local is 18+/-. Yesterday I got to try out the Scan Gauge. Air temp was 44 degrees. Water temp was 46 degrees. Within 3 miles of driving, water reached 182. The short trip was only 4.1 miles. I drove as normal and the mileage for the trip was 15.2 mpg. I was at the destination about 1/2 hour and the engine had a small amount of time to cool. Water was about 140 degrees or so when I started back home. I drove as usual and the engine reached 182 degrees within a mile or so. The return trip netted 18+ mpg. Same amount of hills in both directions. 1 stop sign and 2 traffic lights in both directions and 4 road changes. Most of the trip involved 45 mph limits. The fastest I drove was 49 and the average speed was 29 according to the Scan Gauge. I'm thinking it calculates distance and total run time for the "average" speed. It was a bit disheartening to be sitting still and watching the "Average" mileage dropping. Getting up to speed from a complete stop showed 2-3 mpg in low gear with moderate acceleration. With a light foot it jumped to 3-5 mpg. Just for drill, while the engine was at operating temp, I went back to the same destination. That trip netted 21+ mpg. When returning, watched the Scan Gauge closely and really tried to optimize mileage. That trip showed my top speed to be 45 mph, and average speed of 28 mph, and netted 23.9 MPG. So the tranny never shifted into 5th gear. This thing really brings home how every little thing we do affects our mileage. I don't know how accurate it is. But it definitely indicates mileage fluctuations due to terrain and throttle. It also showed a 3+ to 5 mpg difference between cold, warm and hot engine. Going to be interesting to get out on the open road and find the sweet spot for the engine in 5th gear. 
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Replying to: scottgbwi (Oct 31, 2008 12:03 pm)
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| Traveling from Virginia to Florida, aprox. 800 miles, I got 21.5 MPG. The trip included 2 adults, 2 children, and a full load of luggage and gifts. My Pilot had less than 1,000 miles and I did not use cruse control. I noticed that I had better fuel economy in the mountains. I suspect I would have even better mileage in the flatter areas if I were using cruse control. | |
bought 09 pilot ex 4wd end of sept getting around 16.5 mpg city,20 21highway all the sudden dropped to13mpg overall took to dealer ran codes told me nothing was wrong could be due to the additives added to gas in winter NEVER herd of that also said same problem with mini van I thoght VCM is supposed t give better gas mileage
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Replying to: dschnit (Jan 18, 2009 5:16 am) Joking aside, winter fuel does typically cause a drop in fuel economy due to the additives in it; the dealer isn't yanking your chain. VCM does help fuel mileage, and I suspect yours would be worse without it. Where do you live? Do you warm up your car in the morning before driving it during the winter? |
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I have a 2004 Pilot and I was getting 23-24 on the highway. My mileage suddenly dropped to under 20 on the highway. The only known change was that I put on a set of Wrangler MS tires. I had the dealer put the vehicle on the computer and they said there was no problem. Has anyone experienced a similar problem? I can't believe that it is just the tires.
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Replying to: peteinny (Jan 22, 2009 12:22 pm)  Serously. If you just had them installed, tire-stores are notorius under-inflators. Cushy/quiet ride for you, faster wearing tires for them. Win/win!
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Replying to: peteinny (Jan 22, 2009 12:22 pm) Larger tires roll a little farther with each rotation. The speedometer/odometer is reading rotations. At indicated 70mph you might be actually moving 73 or so. (Just using that as a number). There is more wind resistance. Also the "Effective" gear ratio for the axle has been changed by the larger tires and the engine under a heavier load while pushing the car through 74 mph air while the speedometer is only seeing 70 mph. If the tires are wider, there will be more friction and resistance as the tires contact the road. If they have a more aggressive tread, there is more wind resistance to their turning. If they are heavier, there is more weight for the engine to get and keep turning as well as more weight added to the vehicle. And yes, check the tire pressure. Each item is not much by itself, but can really add up. Especially if you tend to drive at 70+ on the road. When you calculate your MPG by dividing gallons used into miles driven for a tank of gas, keep in mind that (with larger diameter tires) you actually traveled farther than the odometer showed, so your mileage is a bit better than your calculations will show. FWIW my Scangage says I get several mpg less at 70 than at 60 mph. I believe the largest culprit there is the wind resistance on the front of the 03 Pilot. Basically wind resistance is the speed squared times the frontal area of the front of the vehicle. As the frontal area remains ( unless roof top carries and stuff are added) constant let's call that "A". At 60 mph the formula would look like 60X60XA or 3600 X A. At 70 mph it would be 4900 X A. So 70 mph creates 36% more wind resistance than 60 mph. That doesn't correlate to 36% less mileage, because wind resistance is just one of the things that figure into the mix. Without getting into efficiency of the engine at various RPM, blah, blah,,,,,, In a nut shell, yes, the type and size of a tire can create a noticeable difference in mileage. Kip
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