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11-29-2011
I've never used Lukoil gas before, so i was running low. Got some premium. Immediately on the ride home i went from 22.4 to 24.3. What the hell? Do some gases give you better mpgs? I heard Lukoil wasn't even that great of gas and i just gained these mpgs.
11-29-2011
Were you always using 91+ octane?
11-29-2011
the DIC likes to lie.
11-29-2011
I've always put 93 octane in it, no 91 around here
11-29-2011
Lukoil is decent. I've used Lukoil, Sunoco, BP, and Exxon 93 with similar results.Originally Posted by GTLGDP
11-29-2011
The DIC is a joke.
Run the math when you fill up to get real MPG.
The only variable that your can change to increase your MPG any significant amount is your driving style and or engine/drivetrain. Crappy gas versus premium, oil/fuel additives etc will only change your MPG within the margin of error.
11-29-2011
I agree on the whole doing the math part of figuring MPGs over trusting the dic.
But there are MANY factors that can mess with your MPGs. CPS, Too hot or too cold of plugs, bad plug wires, bad coils, clogged fuel filter, bad or weak fuel pump, seized brake calipers, I could go on and on.
Originally Posted by W-Body Store
11-29-2011
Those can all affect your MPG, but they're small and each and every one of them are trivialized by your driving style.
In other words: if you really want better MPG, drive like an old lady.
I will never discourage anyone from tuning, getting new filters, better plugs, better gas etc. But if the end-goal is better MPG, you're wasting your time unless you're also willing to modify how you drive.
11-29-2011
The DIC doesn't lie..it does the same thing a calculator does...distance divided by gallons=average MPG..how can it lie?
11-29-2011
You miss the point...
It is indeed doing a miles/gallons calculation but its estimation of gallons is flawed. I don't know if it uses the sender or metered flow rate or whatever, but when I do the math at the end of the tank the DIC is lucky to be within 20%.
They're famous for being inaccurate.
11-29-2011
You have to keep in mind, over 80% of people on this site don't perform regular maintnance other than oil changes. With proper maintnance, yes, only driving style is a factor, but most of the time, that is not going to be the case.
I also disagree on the "driving like an old lady" theory. Its all about avoiding stop signs, stop lights, and getting on interstates and highways as much as possible. Idling is a waste of fuel, but you can't turn the car off, because startup uses fuel, so run that yellow whenever possible.
The key as far as the car goes really is a proper Air/Fuel/Spark mixture on a well maintained car. Nothing more, nothing less.
Originally Posted by W-Body Store
11-29-2011
At 25.2 now. And service engine light popped on again. Hasn't been on in a week(o2 sensor and knock sensor) so it should even be better when i fix the o2 sensor.
11-30-2011
You are vastly over-simplifying how a car works. It doesn't know how far it actually traveled, but how many times its wheel bearing spun. Which can vary a good deal if your tire is the wrong size, bald, under-inflated, etc. This part of the car won't set off the tire inflation alarm until it detects (i believe) ~12psi under whatever it was set to. It's not sure the tire is under-inflated until that point, which lets you know just how imprecise it is. It doesn't even know how many gallons are in a tank, but merely how high the float is relative to the pump - which you already varies greatly by the vehicle's incline. So that's clearly got nothing to do with it.
I think the (most of the) rest is based on the front O2 sensor, but I'm probably wrong there... not something that's concerned me to look into in depth.
That being said, consensus seems to indicate that 04+ models are nearly spot-on while 97-03 models make something akin to wild guesses than calculations.
11-30-2011
Actually if you're idling for more than 10 seconds you're better off shutting it off and restarting it when you need to move.
11-30-2011
I actually do have really bad tires, but don't have the money to replace them yet at all. I'm just waiting for it to go right back down to 22 where it usually was
11-30-2011
Probably scored some gas without ethanol in it.
11-30-2011
back in the 80's my parents had a caddy eldorado, and it had a dic, with avg mpg and so on, and if it had 87 in the tank, and then you put in super, you would see a increase in mpg on the dic, higher octane should net a few more mpg.
so maybe the gas you usually get sucks, and the new gas has a higher octane,
think about this, the tank is full and still getting higher mpg, and a full tank adds the weight of 2 fat kids in the back seat.
this is why we race on a empty tank of gas. or under a 1/4 tank anyways.
11-30-2011
I've never actually gotten a full tank yet, i usually get gas when i'm at 1/4 tank, then i get up a little bit higher then half when i buy gas.
11-30-2011
I don't even know if it's that accurate....
A crude MPG calculation can be made using vaccuum and speedo. My guess is that the 97-03 uses something like that considering their laughably bad accuracy.
11-30-2011
And how does your car calculate speed?
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