Gas mileage drop from the late 90's to now - JeepForum.com

 
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post #1 of 10 Old 03-21-2012, 09:10 AM Thread Starter
greenlawnjeeper
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Gas mileage drop from the late 90's to now

I ran across some old mpg paperwork that I had. In the late 90's when my 1996 Cherokee had 7K miles on it, I was getting 16-17 mpg non-trip mpg on it. Now (and it has been like this for at least the last couple-few years) it's around 12-13 mpg. Vehicle now has 90K miles on it and I'm running synthetic 10w-30 - back then I was running 50/50 GTX/Syntex 10w-30. Is this due to ethonol entirely or just the motor getting loose? thanks, Fred


'96 Cherokee Country, Magnaflow cat and Borla exhaust, Hella 550's, Up Country suspension, Michelin MS 2's in 235x15 and Edelbrock IAS shocks. 91K orig. miles - the wife uses it ('cept when I borrow it to go huntin').
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post #2 of 10 Old 03-21-2012, 09:32 AM
Azzy
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Ethanol packs less energy per volume than gas. So, we are getting watered down gas at high prices, and higher food prices.

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post #3 of 10 Old 03-21-2012, 09:45 AM Thread Starter
greenlawnjeeper
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Yea, I figured it would kill mileage but I didn't think by that much

'96 Cherokee Country, Magnaflow cat and Borla exhaust, Hella 550's, Up Country suspension, Michelin MS 2's in 235x15 and Edelbrock IAS shocks. 91K orig. miles - the wife uses it ('cept when I borrow it to go huntin').
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post #4 of 10 Old 03-21-2012, 11:43 AM
Azzy
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When I can find real gas for my bike, I get much better mileage and my power band moves a bit. Wish I could get the stuff they get in Alaska, no additives, just plain jane good old gas that stores for years without varnishing.

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post #5 of 10 Old 03-21-2012, 08:24 PM
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I don't think ethanol alone would explain the change in mpg... What matters is the octane level. Gas formulation changes even between summer/winter seasons anyways. The change in oil wouldn't either.

You probably need a tune up. Start with the basics (air filter, fluids...). Make sure your battery conections are clean and corrosion free. Same with your ground connections. A bad sensor like the O2 sensor can have a major impact on fuel consumption also.
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post #6 of 10 Old 03-21-2012, 10:26 PM
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And I would add to that change plugs wire and look for corrosion under the distributor cap. Made a huge improvement for me.
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post #7 of 10 Old 03-22-2012, 10:13 AM
rsurran
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Around here we have several gas stations that sell non-ethanol gas. It's a little more but the boaters, bikers, and farmers use it. Outboard motors, chain saws etc. really have problems with ethanol.

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post #8 of 10 Old 03-23-2012, 01:48 AM
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Quote:
Originally Posted by rsurran View Post
Around here we have several gas stations that sell non-ethanol gas. It's a little more but the boaters, bikers, and farmers use it. Outboard motors, chain saws etc. really have problems with ethanol.
I think this would be more a chemical compatibility issue than a loss of fuel potency. I heard something about ethanol eating up fuel pumps on some older vehicles. Gas typically contains up to 10% ethanol.
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post #9 of 10 Old 03-23-2012, 08:29 AM
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Ethanol gas, old oxygen sensors, etc are contributing to it ...

2000 XJ - 3.5'' Lift & Skinny Mudders.
Previous: A CJ, Few TJs and JK.
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post #10 of 10 Old 03-23-2012, 09:48 AM
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Plus, wires, filters (air, fuel, oil), pcv valve, distro cap, and distro rotor. Also seafoam it (NOT in the oil) or run fuel injector cleaner through the gas tank.

O2 sensor could be going bad or the injectors may just be old and need replacing.

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