Tires, my secret sauce formula.
My tires were at 55psi and i went back down to 30psi for a couple of days. I have never seen my gas gauge move so fast. So even with the screwed up right side of the car I pumped them back up to 50psi. My gas gauge started to move slow again. I think the pumped up tires increased 5 out of the 6mpg that I have increased before I pumped up them up. Let's discuss a pumped up tire.
-A pumped up tire gets harder -A pumped up tire weighs more -A pumped up tire has less rolling resistence(still don't get this one) I personally think tire stuff is voo doo magic like the automatic transmission. Let's discuss tires, especially rolling resistence and what it is and how it changes with higher psi. |
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i think you must get about a mile to the gallon to be able to see your gas gauge, move. i only ever notice it after a hard turn.
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My gas gauge moves too on sharp turns but once I'm driving straight it's very accurate. After it gets to E I don't know how much fuel I got till the lamp goes on. As soon as the lamp goes on I know I have 50-60 miles of fuel left. |
the gas gauge will never be as accuate as a scangauge. It dips and moves too much, under a FAS sometimes it will have a mind of its own! I find just tracking mileage with your odometer usually is always the accuate solution.
The needle is evil |
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I basically know absolutely for certain that my car will go 570 km on a tank (40 liter tank - 2 liter safety margin = 38 liters * 15 km/liter worst-cast mileage = 570 km). Anything under 570 km and I'm safe to keep going. But, this thread was about tires and now we're chatting about gas gauges. Compaq, I had my tires at 40-43 psi for my last tank compared to my usual of 33 psi. Unfortunately I can't definitively say how much they contributed to my 13% mileage increase due to major environmental changes and some slight driving style changes, but they must have contributed some. However I don't know how you would measure the rolling resistance of the tires at any given psi. sq. in. tire footprint x road friction? I don't know. EDIT: Oh, that wikipedia link has formulas. Note to self: Read first then answer next time. |
I have done extensive testing under controlled conditions with the Prius and the difference between 35 PSI and 60 PSI was only 2.5%. In your case that would be 1 MPG. I have noticed a 3-5 MPG increase due to switching to smaller, lighter wheels with smaller, lighter LRR tires,
Compaq, I am dumbfounded by your results. A 33% increase in FE, IMHO, cannot be explained by a change in tire pressure alone, unless your tires were at 10PSI to begin with. |
I agree with Krausdb.
At 29 or 30 psi, yes, you are going to have high rolling resistance, which will cost a couple mpg, but the only difference you will find between 43 psi and 50 psi is that your teeth don't rattle on every pavement joint. I tested and lost no mpg going from 50 down to 43. That's what I'm running now. I bought some larger diameter LRR tires, which just arrived, and we'll see if they help any. |
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voodoo magic? its proven that higher psi saves gas. its also proven that slush boxes suck. |
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