Optimax question?
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Scooby Regular
Joined: Jan 2002
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Originally Posted by RSTurbo50
Im about to buy a 99 UK Model Impreza Turbo.......
Does the car need to run on optimax/super unleaded or can you use normal unleaded petrol?
Stu
Does the car need to run on optimax/super unleaded or can you use normal unleaded petrol?
Stu
Scooby Senior
Joined: Apr 2002
Posts: 14,231
Likes: 5
From: Harrogate
The MPG increase won't nearly be enough to run SUL particularly Optimax.
My car certainly leaves me better off when i use SUL.
I posted this 4 years ago on this very subject
A few weeks ago there was a debate with regards to SUL and will there be a mpg improvement. I have used it for the last 7 tanks.
On normal unleaded i was averaging about 18.8mpg. After allowing 3 tanks for the ecu to reset itself i am now averging 20.8 mpg. By my thinking thats an improvement of 2 mpg.
So if i fill with: unleaded. 13.2 gallons at £3.40 = £44.88
: SUL . 13.2 gallons at £3.59 = £47.39
It costs £2.51 extra for the SUL. But if i'm getting 2 mpg gallon more then 2 x 13.2 (gallons)=26.4 extra miles per tank of SUL which is a gain of about 1.27 gallons.
So 1.27 gallons of normal unleaded is £4.32 Take off the extra which SUL costs per tank (£2.51) and i have a gain of £1.81 per tank.
On normal unleaded i was averaging about 18.8mpg. After allowing 3 tanks for the ecu to reset itself i am now averging 20.8 mpg. By my thinking thats an improvement of 2 mpg.
So if i fill with: unleaded. 13.2 gallons at £3.40 = £44.88
: SUL . 13.2 gallons at £3.59 = £47.39
It costs £2.51 extra for the SUL. But if i'm getting 2 mpg gallon more then 2 x 13.2 (gallons)=26.4 extra miles per tank of SUL which is a gain of about 1.27 gallons.
So 1.27 gallons of normal unleaded is £4.32 Take off the extra which SUL costs per tank (£2.51) and i have a gain of £1.81 per tank.
Originally Posted by bluepolarbear
The car, by law, came designed to run happily on 95ron. So if no mods it is fine. SUL may give a feel of better pick up but it won't translate to more than a couple of tenths in terms of real speed. The MPG increase won't nearly be enough to run SUL particularly Optimax.
Joined: Apr 2002
Posts: 38,078
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From: The hell where youth and laughter go
Does it also say Gasoline? We run on petroleum 'ere 
Read the manual...it's more specific.
Anyhoo back to back test over 2 months on the same dreary slog to work and back: 95ron 24mpg, Optimax 24mpg
Read the manual...it's more specific.Anyhoo back to back test over 2 months on the same dreary slog to work and back: 95ron 24mpg, Optimax 24mpg
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