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#31
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Wow, where are these crazy MPG figures coming from ?
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#32
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Wow, where are these crazy MPG figures coming from ?
who cares what the overhead states. it is a average anyway
just filling the tank pulling out on the road and matting it throws milage out the window by going with what the overhead reads! real is what i am all about Bill Putney wrote: > philthy wrote: > > one thing i do see form time to time is somehow the pinion factor setting for > > tire size gets changed in the pcm and that can affect milage and if you go to > > a taller tire it will improve milage > > A taller tire will imporve *real* mileage, but not as *calculated* using > the odometer or the overhead computer (if the pinion factor is not > corrected for the tire size change). > > Bill Putney > (To reply by e-mail, replace the last letter of the alphabet in my > address with the letter 'x') |
#33
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Wow, where are these crazy MPG figures coming from ?
In article <Pp7TT5WKBvRn-pn2-sGlB3Kz9mZ8j@localhost>,
> wrote: > rented a 2007 PT Sedan, with the > usual equipment, non-turbo, the highest we got was 25 on Interstate > 10, driving a steady 60mph with the cruise control on. Coming back, > we upped it to 65 with cruise and got 23mpg. That is not acceptable. > As I stated, I love the car's design, the utility, etc. I agree it's low, but I see one thing that could be a significant factor in the low PT Cruiser MPG that appears common. Poor streamlining; the front, steep rear and particularly the NON FLAT sides. BTW the EPA HWY mileage figures are measured at much less than a steady 65MPH, so poorer streamlining would show more difference at a steady 65MPH. I consistently get 29MPG HWY at 65MPH with my '95 3.3L Concorde. Just compare the VW new Beetle 2.5L 23/31 mpg New Beetle Convertible 2.5L 22/30 mpg of the same engine. The convertible has not as smooth a roof and is likely slightly heavier, resulting in slightly lower EPA mileage. The difference would be greater at a steady 65MPH. The '07 PT Cruiser 2.4L I4 150HP is rated at 22/29 mpg. How about this for an all around FAST compact car for $23k! Caliber SRT4 2.4L turbo 285HP 22/28MPG. 0-60 = 6 sec. http://www.allpar.com/cars/dodge/caliber-srt4.html |
#34
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Wow, where are these crazy MPG figures coming from ?
I agree that the overhead is not as accurate as the odometer in a given situation with the correct tire size. But average over a tank would be fairly consistent on a given vehicle. But yes - I agree that the overhead is not the most accurate. So you're saying you'd go by the odometer? It definitely would not reflect any improvement in mileage from a larger OD tire without either correcting the pinion factor or putting a correction factor into the calculations. The odometer does not know the tire is bigger. Any improvement in mileage from a bigger tire will not come out in the calculations (and may even result in a decreased *calculated* mileage due to the slight extra load - but only because the odometer reading does not reflect the extra distance traveled due to the larger tire - once that is factored in - yes - the calculation will reflect the positive effect of the larger tire). Bill Putney (To reply by e-mail, replace the last letter of the alphabet in my address with the letter 'x') philthy wrote: > who cares what the overhead states. it is a average anyway > just filling the tank pulling out on the road and matting it throws milage out the > window by going with what the overhead reads! real is what i am all about > > Bill Putney wrote: > > >>philthy wrote: >> >>>one thing i do see form time to time is somehow the pinion factor setting for >>>tire size gets changed in the pcm and that can affect milage and if you go to >>>a taller tire it will improve milage >> >>A taller tire will imporve *real* mileage, but not as *calculated* using >> the odometer or the overhead computer (if the pinion factor is not >>corrected for the tire size change). >> >>Bill Putney >>(To reply by e-mail, replace the last letter of the alphabet in my >>address with the letter 'x') |
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