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Dodge Magnum MPG-Real World Numbers

36 messages,  Last post on Jul 26, 2008 at 9:31 PM

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What is this discussion about? Dodge Magnum, Fuel Efficiency (MPG), Wagon

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#18 of 36 premium gas by kecaj Apr 13, 2007 (8:20 am)
Did anyone try premium, and why manuf. wants only 89. From my experience all cars run better on 93 or up Replies to this message: bbfd86 (Sep 05, 2007 4:46 am) jacklionel (Nov 20, 2007 11:48 am)
#19 of 36 Re: premium gas [kecaj] by bbfd86 Sep 05, 2007 (4:46 am)
Replying to: kecaj (Apr 13, 2007 8:20 am) My understanding is that you need to stick with the octane the car is rated for. If you trade up or down the car's computer will adjust the mixture and negate any benefits.   My 2005 R/T AWD with an AFE cold air intake gets 22-23mpg on the highway when cruising between 65mph and 75mph. At 80mph and above I get 19mpg. Around town I get 16mpg to 18mpg. While the gas mileage is not good compare to my previous car, a Saab 9-5 Aero Wagon, the Hemi is just too much fun. As a volunteer firefighter it gets me to the fire house real fast! Replies to this message: jacklionel (Nov 20, 2007 11:48 am)
#20 of 36 Re: premium gas [bbfd86] by jacklionel Nov 20, 2007 (11:48 am)
Replying to: bbfd86 (Sep 05, 2007 4:46 am) The revised (lower, more realistic) EPA ratings are now out. Check out fueleconomy.gov.   Dodge recommends removing the roof rack cross bars when you are not using them.   The principal determinant of fuel mileage is vehicle weight, regardless of all other factors (of course, hybrids are a special case). Notice that the 3.5 V6 and the 5.7 V-8 get identical mileage (if driven in an identical manner). Once you stick your foot into it, that's another story.
#21 of 36 Octane by jacklionel Nov 30, 2007 (5:28 am)
About the octane: The manual warns that heavy detonation can damage the engine (duh!).   But the brochures say that the Hemi, at least, has two detonation sensors, so that shouldn't be a problem. I don't hear any detonation with my '06 Hemi.   (My '87 Grand National has a detonation sensor, also, and retards the spark if it senses any. You lose a little power with lower octane gas, but no harm done).
#22 of 36 SRT8 Magnum by srt8dan Dec 01, 2007 (8:23 pm)
I have an SRT8Magnum and get almost 21 mpg at a steady 75 mph. In town if I am getting on it, I get about 12 mpg.
#23 of 36 My Magnum MPG by magnmlover77 Jan 06, 2008 (11:49 am)
Over the summer I did a trip with my 3.5 SXT covering nearly 4000 miles over 6 weeks. In brutally hot summer weather on the prairies at 110-120 kph ( 70-75mph) I got 31.82 miles per gallon on regular gas with AC on . Had I slowed down I'm sure it would be higher. I did move to synthetic oil (Castrol GTX) and swapped out to a low restriction air filter. Now that it is being discontinued I know I will never get rid of it. It is too much fun.
#24 of 36 Re: Dodge Magnum: MPG-Real World Numbers [pf_flyer] by jacklionel Jan 27, 2008 (11:00 am)
Replying to: pf_flyer (Jun 12, 2006 8:07 am) My (N.O.S.) 2006 AWD hemi gets around 12 MPG around town (I drive very conservatively most of the time). When the service manager took the car for a few days to diagnose a problem, he told me that HE got around 12.5, and didn't seem to think that it was out of the ordinary.   On limited hwy miles, I have gotten around 21-22 MPG at 65-70 MPH (so much for the 4-cylinder shutdown mode).   Compared to this car, my '87 Buick Grand National is an economy car. Like someone said, if I get my foot into it with the Grand National, mileage suffers, but I could easily get 18-20 all-around if I lay off of the turbo.   These Magnum numbers are WAY below even the revised, lower EPA figures.   One thing I noticed is that there is soot in the tailpipes of my Magnum (none of my other modern cars do this). You can feel it with your fingers, it is a greasy-feeling black powder. Soot, not oil.   I think that I am going to take the car to an independent shop and ask him about this; maybe have him run an exhaust-gas analysis. If he doesn't have an analyzer, I think that I might pay for a full emissions test (with the all-wheel drive, it will only be a two-point idle test, since they can't do a full dynamometer test with AWD).   I also have a new 2007 Toyota Sienna (minivan). Both cars weigh about 4,200 lbs. Of course, the hemi is a larger engine, and is geared down a little more. Then there is the issue of the increased friction of the AWD system. Still, I can easily get 18 mpg with the Sienna with just a bit of hwy miles mixed in, and can get 24 MPG cruising at 70-75 MPH.   Remember, the Sienna is both much higher and wider than the (narrow) Magnum, so the frontal area is much greater. So the disparity in mileage just doesn't make any sense.   To me (a virtual lifelong car guy and mechanical engineer), the critical clue is the exhaust pipe soot. I am going to have that investigated. Replies to this message: bbfd86 (Jul 01, 2008 9:44 am)
#25 of 36 Re: Gas Mileage [midnightblumag] by 2005maggie Apr 04, 2008 (2:19 pm)
Replying to: midnightblumag (Oct 07, 2005 7:28 am) I Just bought a 05 RT AWD with 33000 miles. I drive 95mile a day and the best I got was 19.1 based upon my consumpsion. The trip advisor states I am getting between16 & 18 while driving HWY 60-70. I find the trip advisor states I am getting better milage when driving a little harder. But judging from reports I see others are getting closer to 23 my 65ish speed. Any comments or updates? Replies to this message: 2005maggie (Apr 04, 2008 2:24 pm) jacklionel (Apr 04, 2008 9:38 pm) 2005maggie (May 20, 2008 10:47 am) and 2 more... jacklionel (Apr 04, 2008 9:31 pm)
#26 of 36 Re: Gas Mileage [2005maggie] by 2005maggie Apr 04, 2008 (2:24 pm)
Replying to: 2005maggie (Apr 04, 2008 2:19 pm) I must also add that I own a 1968 Charger that stock has 335 HP but with a small bore (375HP). I dont feel 340HP. Iknow there is a 1700lbs difference(magnum more) but I am a little dissapointed. I drove a ne 300 and found the same performance(lacking). Maybe it doesnt have the throaty tone to impress drivers. Who knows. Replies to this message: jacklionel (Apr 04, 2008 9:38 pm) 2005maggie (May 20, 2008 10:47 am) 2005maggie (May 20, 2008 1:16 pm) and 1 more...
#27 of 36 Re: Gas Mileage [2005maggie] by jacklionel Apr 04, 2008 (9:31 pm)
Replying to: 2005maggie (Apr 04, 2008 2:19 pm) I have been running injector cleaner and gasoline stabilizer through my 2006 AWD. Mileage around town is now about 15-16 (the revised EPA city mileage is 15 mpg). At around 65-70, I get around 22, which is the new EPA highway mileage. So one of the sensors (probably the oxygen sensor) must have been fouled by varnish after sitting around for two years.

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