great mpg
Rookie
Joined: Dec 2007
Posts: 88
Likes: 0
From: Michigan City
RE: great mpg
I have done the obvious things like you said but the tires that are on it now I would say maybe 5000 miles left at the most on them. One has a flat spot in the rear and the other rear has a bulge comming out the side...I'm hydroplaning on large puddles....I'm waiting for our little tax checks to come in may to buy some new tires...but still I didn't think it would kill me that much with my MPG...I still have stock exhaust but I just dont' know what more I can do besides exhaust and computer. Would tires make a huge differance? I'm going to take a step up from my 275-70-17 to 285-70-17 just because the 275 do not have that much in options for what I am looking for.
Veteran
Joined: Mar 2008
Posts: 381
Likes: 0
RE: great mpg
Tires aren't the biggest thing in the world to worry about. Most of the efficiency people recieve is from the engine, load, and aerodynamics.
Make sure your engine is performing at it's best. Low restriction exhaust will help, CAI will help, O2 sensors working properly will help, full tire pressure will help, good synthetic like AMSOIL, Royal Purple, or Mobil from front to back will certainly help, Low resistance, high amperage delivering spark plug wires and plugs will help, indexed spark plugs will help, airtight plenum gasket will help, and most of all... Measuring your mileage makes the most difference. You can see what effect doing this or that has upon your efficiency.
I just got myself a scanguage for $160 which measures engine parameters and diagnoses trouble codes. Now I can tell exactly what kind of mileage I'm getting at various speeds and such and what effects my mods have on the engine. Using this, I can now tell which gas in the area gives the best mileage, and best of all, I can see exactly which speed to travel in order to get the best mileage.
My first findings have been this. Standing on the pedal going 75-85 with traffic gets me from A to B exactly 5 minutes sooner but brings my mileage down to about 7-9 MPG in doing so...
Make sure your engine is performing at it's best. Low restriction exhaust will help, CAI will help, O2 sensors working properly will help, full tire pressure will help, good synthetic like AMSOIL, Royal Purple, or Mobil from front to back will certainly help, Low resistance, high amperage delivering spark plug wires and plugs will help, indexed spark plugs will help, airtight plenum gasket will help, and most of all... Measuring your mileage makes the most difference. You can see what effect doing this or that has upon your efficiency.
I just got myself a scanguage for $160 which measures engine parameters and diagnoses trouble codes. Now I can tell exactly what kind of mileage I'm getting at various speeds and such and what effects my mods have on the engine. Using this, I can now tell which gas in the area gives the best mileage, and best of all, I can see exactly which speed to travel in order to get the best mileage.
My first findings have been this. Standing on the pedal going 75-85 with traffic gets me from A to B exactly 5 minutes sooner but brings my mileage down to about 7-9 MPG in doing so...
Thread Starter
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Professional
Joined: Feb 2008
Posts: 199
Likes: 0
From: CA
RE: great mpg
i have the 5.2L magnum with the 3.55. my tires are larger than stock though and i was thinking of getting a 3.85 or so. i think i will lose a little mpg, but i will gain back some power.
Champion
Joined: Nov 2006
Posts: 2,902
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From:
RE: great mpg
ORIGINAL: dodgeforlife15
i have the 5.2L magnum with the 3.55. my tires are larger than stock though and i was thinking of getting a 3.85 or so. i think i will lose a little mpg, but i will gain back some power.
i have the 5.2L magnum with the 3.55. my tires are larger than stock though and i was thinking of getting a 3.85 or so. i think i will lose a little mpg, but i will gain back some power.