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View Poll Results: What is your MPG
0-10 10 0.39%
10-20 91 3.52%
20-25 527 20.41%
25-30 992 38.42%
30-35 698 27.03%
35-40 210 8.13%
40+ 54 2.09%
Voters: 2582. You may not vote on this poll

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Old 05-31-2007, 11:10 AM   #191
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Quote:
Originally Posted by 4dse View Post
Yesterdays fillup yielded 43.3 mpg ! Mostly highway driving - but I am getting very impressed ! fwiw 42 psi front and rear tires, cruise at 60 mph with the A/C on .
42 psi is about 10 psi over the recommended pressure... i bet your tires will wear unevenly over time..

perfect pressure is about 32-34 psi

i blew 2 tires, because the damn shop that i had put them on filled them up to 40psi, and i hit a pothole, and blew one, hit a pothole, and blew another

watch yourself there
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Old 05-31-2007, 04:59 PM   #192
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i average around 26 with about 6 m of twisty turning road known as devil's slide, 5 m of stop lights, 6m of hwy that ends with a big hill to climb, 5 m of hwy and then 3 m of san francisco city streets complete with a hill that stops you at lights about every other block. when i consider all that i figure i'm doing pretty good. still about 10 mpg better than my previous vehicle and my billfold can definitely feel the difference. i was a bit disappointed i wasn't getting closer to 30 at first but when i really look at the conditions i drive in, they are far from ideal.
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Old 05-31-2007, 08:18 PM   #193
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Does the ECU cut off fuel delivery when you're coasting downhill in gear (in a manual)? I'm told some cars do this, and you would get better mileage than going into neutral.
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Old 05-31-2007, 08:41 PM   #194
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Does the ECU cut off fuel delivery when you're coasting downhill in gear (in a manual)? I'm told some cars do this, and you would get better mileage than going into neutral.
i dont think so.. but i could be wrong
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Old 05-31-2007, 09:05 PM   #195
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Quote:
Originally Posted by matthewstetz View Post
42 psi is about 10 psi over the recommended pressure... i bet your tires will wear unevenly over time..

perfect pressure is about 32-34 psi

i blew 2 tires, because the damn shop that i had put them on filled them up to 40psi, and i hit a pothole, and blew one, hit a pothole, and blew another

watch yourself there
Thanks for the concern and thoughts on the tire pressures - max sidewall pressure is 44 psi , so I'm still safe in that regard . I am watching for uneven wear and planning to rotate the tires @ 1500miles sooner than the manual states . That said I'm running 28.7% over EPA rating and still climbing . This last tank was at 45.8 per ScangaugeII , with a 5.5% correction on last fillup -yesterdays wind and rain dropped it down to 41.6 mpg(hand calculated on fillup = 254.5 miles/6.11 gallons used) .

eta: My Gas Log (for those interested in better mpg #'s Gassavers )
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Old 06-01-2007, 03:34 PM   #196
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hey guys, i recently bought copper cores and ran a bigger gap, after checking all tire pressures and bumping them up 1lb over recommended, (33f 30r) im averaging 35.5, this weekend i plan on bumping the gap to .065 since my FRPP wires are on the car now (currently .06, stock is .055) and we will see what happens, wish me luck!
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Old 06-01-2007, 05:47 PM   #197
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Quote:
Originally Posted by 4dse View Post
Thanks for the concern and thoughts on the tire pressures - max sidewall pressure is 44 psi , so I'm still safe in that regard . I am watching for uneven wear and planning to rotate the tires @ 1500miles sooner than the manual states . That said I'm running 28.7% over EPA rating and still climbing . This last tank was at 45.8 per ScangaugeII , with a 5.5% correction on last fillup -yesterdays wind and rain dropped it down to 41.6 mpg(hand calculated on fillup = 254.5 miles/6.11 gallons used) .

eta: My Gas Log (for those interested in better mpg #'s Gassavers )

http://www.tirerack.com/tires/tirete....jsp?techid=21

"it seems to me that filling the tire to the *tire mfr's* printed max
> should be OK, giving me 1. better mpg's 2. perhaps a bumpier ride,
> and 3. perhaps less traction/longer braking distance than the car
> mfr's recommended psi.

1) While increase tire pressure may reduce rolling resistance and
improve gas mileage, it is not a straight line effect. Past some
point, increasing the pressure further will not significantly affect
fuel economy. Given the pressure of CAFE regulations in the US in is
very unlikely that recommended tire pressures are so low as to greatly
reduce fuel economy.

2) Higher pressure will definitely result in a stiffer ride. You may
prefer this. On the other hand, higher pressures also make the tires
more vulnerable to damage from stones and broken pavement. Higher tire
pressure also result in a higher level of road shocks being
transmitted to the suspension on body.

3) Handling can be greatly affected by tire pressure - particularly
the front to rear differential. Excessively high pressure can
definitely increase braking distances and reduce cornering ability.
High pressures can also make the steering very "nervous."

> Since I drive pretty much slow as shit anyway (or with the "flow of
> traffic"), mpg's are my main priority, as long as I'm not positively
> risking my life.
> I've noticed no uneven wear on previous cars, by filling to the max.

Radial tires are much more forgiving of incorrect pressure than bias
ply tires. I own a Nissan Frontier, and even with the recommended
pressure in the rear tires I am experiencing excessive wear in the
middle of the tread. Nissan only recommend "one" pressure for the
tires. I am sure this is a "safe" pressure and one that results in
maximum gas mileage. However, for a lightly loaded truck, the pressure
is likely too high. Years ago, manufacturer's usually recommended
different pressures for different conditions (speed, load). In recent
years, this has been replaced by a one pressure fits all situations
recommendation. It is my belief that this pressure is probably higher
than necessary for most conditions since they have to allow for
maximum load and speed and the manufacturer's need to achieve the
highest possible mileage ratings for CAFE."



"It seems to me that filling the tire to the *tire mfr's* printed max
> should be OK, giving me 1. better mpg's 2. perhaps a bumpier ride,
> and 3. perhaps less traction/longer braking distance than the car
> mfr's recommended psi.

Tires are fairly "generic" and are designed so that they can be used
on a host of different vehicles of different weights. The
manufacturer sets a recommended pressure for the specific vehicle
taking in to account things like vehicle weight and handling
characteristics.

If you run the tires up to the max limit you end up riding on the
middle of the tire. Now the tires aren't going to last as long as
they should and your handling / braking goes to pot. Any potential
savings are quickly negated by having to replace the tires early.

Vehicle manufacturers have nothing to gain by intentionally making
their vehicles get worse gas mileage. If you want to save gas I would
work on keeping the tires properly inflated, make sure the engine is
in good tune and most importantly work on driving habits that might be
costing you gas mileage."
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Old 06-01-2007, 08:46 PM   #198
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Thanks again Matt much appreciated .
So I guess a 41 combined mpg tank vs an EPA combined 27 is a minimal savings ? Every penny counts in my book and besides every gallon used is another day in the desert . I want those soldiers home .
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Old 06-02-2007, 07:06 AM   #199
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oh, i know with increased pressure you get better mpg, but there are some drawbacks, like tire wear...
however, my biggest drawback was having to pay for two new tires because they were inflated to 40 or so psi.... it wrecked my tires, especially since their low profile
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Old 06-02-2007, 04:03 PM   #200
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I'm running my fronts at 38 and my rears at 35, seemed to me to be a happy medium when I filled them. Looking at this, it appears correct as well.
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