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Old 12-24-2018, 07:21 PM   #1 (permalink)
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Prius 75-91mpg

Hey folks. This is my work prius, since the photo the aircon, passenger airbags, heater matrix and numerous small parts have been removed. It passed uk MOT test. The main difference in mpg is temperature, for me I put down to transfer efficiency being increased in the summer weather, notably above 25c

With further aerodynamic changes and new lighter parts (seat, windows etc) eventually I expect 80-98mpg

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Old 12-24-2018, 08:19 PM   #2 (permalink)
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I’ve not seen a gutted Prius before, but I applaud the effort... weight is one of the biggest factors in city mileage, which the HSD is already optimized for...
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Old 12-24-2018, 08:53 PM   #3 (permalink)
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How much weight was lost?
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Old 12-25-2018, 01:05 AM   #4 (permalink)
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I'm guessing these are imperial mpgs, so 62-75 mpg US. Still very impressive!
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Old 12-25-2018, 03:54 AM   #5 (permalink)
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How much did you save weight? I failed MOT on my old porsche when I had door panels removed? They said sharp edges are not allowed but there where no edges on the door frames
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Old 12-25-2018, 12:07 PM   #6 (permalink)
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That interior wouldn't pass the yearly MOT (technical inspection) here either
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Old 12-27-2018, 02:04 PM   #7 (permalink)
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Originally Posted by Nathan jones View Post
Hi, thanks for the replies, I would estimate 400kg removed, the seats are obviously the easiest, I would say more weight is on the smaller stuff but is harder work. Will get to the weigh in station next year near me to see exactly. I have another prius thats nearly stock and has more weight for stuff installed, would say gross 1500kg and however its driven wont do above 55.2mpg so for me weight is equal/more to aerodynamics above driving style.

The Yaris has been an idea for me to toy with but it has a drag coefficient I can't work with so plan to get carbon fibre parts made for the prius with the money. I do 30-40k a year in that prius so it pays

...Yes imperial gallons. I hate using the other prius, it's like driving a normal car. I can get 65mpg from a Ibiza 3cyl!!

Merry xmas )
You need to talk with Peter Perkins


You've already made your Prius a 1-seater anyway, may as well go whole hog with the light weight of an Insight...
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Old 12-28-2018, 06:25 AM   #8 (permalink)
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Hey samwiche, wow thanks. I knew of the newer insight and decided against it but didnt know of the mk1. hmmm
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Old 12-28-2018, 08:01 AM   #9 (permalink)
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Much appreciated .

A couple of breakdown companies cover cars without a spare wheel - RAC and AA are not obliged to help

n/b regarding the initial post and measurement. The highest mpg was steady 49mph, little or no gradients with no extra equipment in the car, no cruise, no drafting. The worst was 80mph average with gradient changes and overtaking. I sometimes draft, in the fast lane x5/4x4's are good and behind lorries in 50 zones, although I've not measured that as results are not consistent. Also when I mentioned temperature the results were mid-summer and winter results will be considerable less, maybe 15mpg less

Last edited by Nathan jones; 01-11-2019 at 11:27 AM..
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Old 01-20-2019, 02:33 AM   #10 (permalink)
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this is after the first stage, before the computers got ripped out


..As far as I recall it was'nt quite a full tank, maybe 8/10 but still I was happy. Also see the ambient temps, do make a big difference

Last edited by Nathan jones; 01-26-2019 at 10:26 AM..
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