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Honda Civic Hybrid MPG-Real World Numbers

475 messages,  Last post on Dec 04, 2009 at 3:11 PM

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What is this discussion about? Honda Civic, Hybrid Cars, Fuel Efficiency (MPG), Sedan

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#431 of 475 Re: Mileage problems [mike123] by jim314 May 17, 2009 (11:28 am)
Replying to: mike123 (Apr 23, 2009 11:54 am) I don't believe 18.75 mpg. Possibilites are:    (1) Someone reset the trip meter so the distance travelled was more than 150 mi. Always note and record the odometer too. Confirm the trip odo value by subtraction of odo readings.   (2) On the prior fillup the pump could have shut off early, but on the present one you filled to full. Some Dallas pumps will shut off if the collar is not held tight to the filling seal. The collar controls gasoline vapor emissions during fueling.
#432 of 475 Wow great car! by bradzepfan May 28, 2009 (10:25 am)
Purchased a 2009 Civic Hybrid 4-5 weeks ago and have been experimenting with various driving styles. Don't be alarmed, Southern Cal flow of traffic is often well above 70 MPH! ; ) I won't go into detail about my methods but I am far from a "hyper-miler".   Tank A -- 49.3 MPG (keeping MPH 55-65 range) Tank B -- 50.2 MPG (keeping MPH 65-70 range) Tank C -- 42.4 MPG (keeping MPH 70+ range)
#433 of 475 Like the mpg of my 2009 HCH by myboysthree3 Jun 10, 2009 (7:11 pm)
I'm having fun with the mileage and driving the Honda instead of the Suburban. I have driven almost 3000 miles in the last month and I am averaging 46.6 mpg. last tank I averaged 48 mpg.
#434 of 475 Re: Gas mileage decreased after tire control arm fix [ttenpenny] by jimbenj Jun 14, 2009 (9:51 am)
Replying to: ttenpenny (Feb 03, 2009 9:42 am) This excessive cupping and rear control arm problem is now an official service bulletin notice to Honda service/dealer reps. I had same problem after approx. 10,000 mi. Honda wanted me to pay the full shot for rear control arms, 4 new tires, and alignment. After a lengthy phone tag debacle with a cust. serv. rep I was told Honda would pay for control arms. rear alignment, and 2 tires only after I got the dealership where I purchased the vehicle involved. I had all 4 tires replaced along with control arms and rear alignment. My out of pocket cost was $270. I contacted Honda and requested reimbursement since the only reason I needed 4 tires at 10,000 miles was because of the alignment issue. My mileage incidentally was down to around 30 mpg overall. Honda refused to reimburse me. My mileage is back up to 40mpg combo/overall with a 30 mile daily highway commute. I'm glad the other poster had his entire repair covered. That is the only proper, good business action to take. I will now no longer be purchasing another Honda and I will be certain to tell all of my contacts my story regarding this vehicle and I'll let them decide if I was treated properly. With so many competitors out there I can't believe Honda chose to be penny wise and pound foolish in this case. Replies to this message: mrwaug (Jun 19, 2009 7:00 pm)
#435 of 475 another tank better MPG by myboysthree3 Jun 18, 2009 (5:34 pm)
At my last fill up I ended up with 50.5 MPG. I figure that even with paying the monthly payment and gas for the new Honda I have reduced my monthly transportation costs by $100. The higher the gas prices the more I save.
#436 of 475 Re: Gas mileage decreased after tire control arm fix [jimbenj] by mrwaug Jun 19, 2009 (7:00 pm)
Replying to: jimbenj (Jun 14, 2009 9:51 am) You only needed two tires yet you bought four. It sounds like some fancy footwork at your dealership. Most car company dont care too much about tire wear. I knew of the recall, I took my 07 HCH complying of handling issues(which they do care about, if you get into a crash resulting in handling problems) They replaced the rears arms and suggested new tires, I turned them down, rotated them, and am still driving on them. I have owned several Honda's, including a 89 accord that had 350,000 miles when i sold it. My wife loves her 08 Ridgeline, we also have ATV's Motorcycles and generators. The rear arm issues on my civic has been the only issue requiring warranty work on it. In my book Honda does not really have any competitors. My daughter has a 05 Toyota that is getting ready to loose a transmission. So i am a little biased there, and the rest seem to be headed towards bankrupsy, so that leaves Hyundai and Kia in a strong market (Good luck with either one of them, I owned a Hyundai for 6 months. What a pile) . I am happy with my HCH and 50 mpg that it gets.
#437 of 475 MPG improves by highmpg Jun 20, 2009 (5:49 pm)
I have seemingly found an interesting improvement in MPG in our 2006 HCH. This one usually averages 41 with combined factors (city-hwy-AC ) but if I go up on octane it really likes it! I have tried all major regular gasolines and all are about the same - yet with grade above regular MPG goes up to 46, and some to 48 MPG. This is one of the persistently lower MPG cars, never been able to crack 50 mpg no matter what we tried -- our other 2006 HCH (car #2) always does 47 averages using regular gas. This means either the compression is higher & computer detects pinging-low octane.. or it is just too sensitive to imaginary pinging. Others have written that octane is never a factor - but perhaps for the cars that run a bit lower MPGs it will be worth a try. Replies to this message: mrwaug (Jun 21, 2009 5:17 pm) refields (Jul 25, 2009 5:56 pm)
#438 of 475 Re: MPG improves [highmpg] by mrwaug Jun 21, 2009 (5:17 pm)
Replying to: highmpg (Jun 20, 2009 5:49 pm) in the old days, before electronics, higher octane did not give you more power or better economy over regular grade, but it would allow you to run higher compression and allowed you to advance the timing more, which would give you more power.   So you are right and the others are wrong in regards to higher octane causing better performance/mileage in engines with knock sensors and electronic timing. If you are getting better numbers with premium fuel, then there is a problem. Like you say, it could be too high compression, or an overly sensitive knock sensor. You should try some aggressive top end engine cleaner to remove any carbon deposits off, and make sure that it has the proper spark plug installed, only use the plugs recommended by the manufacture ( there should be a sticker under the hood with plug specs) Replies to this message: refields (Jul 25, 2009 5:56 pm)
#439 of 475 Re: Mileage problems [mrwaug] by davem7 Jun 25, 2009 (3:26 pm)
Replying to: mrwaug (May 11, 2009 5:47 am) I'm still addicted to capping the tank. If I can squeeze l-2 to 2gallons after the auto shut off engages that extends my range(w/0 refueling) another 50-75 miles. Practically speaking what damage could that cause in the long run? Not clear from the description you gave. Replies to this message: mrwaug (Jun 25, 2009 5:53 pm)
#440 of 475 Re: Mileage problems [davem7] by mrwaug Jun 25, 2009 (5:53 pm)
Replying to: davem7 (Jun 25, 2009 3:26 pm) there is a vent at the top of the fuel tank that allows fuel vapors from the gas tank to flow into a canister that is full of carbon particles, the carbon acts like a sponge and traps the fuel vapors. When the engine is running, a valve open that allows engine vacuum to draw air through the canister, causing the fuel vapor to be released from the carbon, and burnt during the normal combustion process. When top off the tank, it is possible for liquid fuel to enter into the carbon canister, either through slosh of heat expansion. When the purge valve opens, the engine gets liquid fuel instead of fuel vapor. So whats the big deal about liquid fuel being drawn into an engine? It acts like a solvent, washing the oil off of the cylinder walls, causing ring wear and it washes down past the rings, into the oil causing it to get diluted with fuel, making it thinner and less of a lubricant. You are already using a 0/20 wt oil, you really dont want it to get much thinner. There also other issues with emissions and the electronic fuel control, but i think that with the complexity of the mechanical side of the engine and the V-tec system, i would be most concerned with fuel wash. Is cramming another gallon of gas into the filler neck worth it.

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