What fuel to use for long drive?

AdrianC

peter3hg said:

AdrianC said:

Enough fuel. That's it.

You don't say what "1.6l 7-seater", but very few will have a knock sensor to allow the ignition map to change, so can't take any benefit from the higher octane. If it's turbocharged, then there's a slightly higher possibility.

I'd be amazed if you could find a mainstream petrol car engine from the last 20 years that didn't have a knock sensor. They all use them so they are protected if ran on lower octane fuel.

<looks out window>
There's one!

tacpot12

I would think that Redex would be a good idea. I put some fuel system cleaner (a cheap bottle from my local motor factors) through the engine of my Mondeo and it did improve the MPG and unexpectedly it also cleared the slight delay in the throttle response when setting off. The car had never had a fuel system cleaner through it before (at least not in the last 20k miles of my ownership.) 

The fuel system cleaner I used was £5 for the bottle, and the mileage improved by about 1.5 mpg which means that the cleaner was paid for after driving 500 miles or so. 

Herzlos

You'll do better for fuel by: servicing the car, making sure tyre pressures are correct and keeping at a steady speed at or below the speed limit.

By all means stick some Redex in it anyway, but it won't have any immediate difference.

peter3hg

AdrianC said:

peter3hg said:

AdrianC said:

Enough fuel. That's it.

You don't say what "1.6l 7-seater", but very few will have a knock sensor to allow the ignition map to change, so can't take any benefit from the higher octane. If it's turbocharged, then there's a slightly higher possibility.

I'd be amazed if you could find a mainstream petrol car engine from the last 20 years that didn't have a knock sensor. They all use them so they are protected if ran on lower octane fuel.

<looks out window>
There's one!

What engine is this then?

I'd be curious to see what method they use for knock detection.

born_again

izawa said:

Hello,

Driving London to Edinburgh. Thinking of filling up with Premium fuel to get more MPG. Alternative is to have normal fuel + Redex or Premium + Redex.

What are your thoughts? Car is a 1.6L 7 seater.

Options

1. Normal Fuel + Redex
2. Premium Fuel + Redex
3. Premium Fuel

Not worried about difference in price since. This exercise is just meant for long drive, while in Scotland it will be normal fuel all the way.

So 400 miles give or take where you are exactly coming from & going too.

So lets say you get 30 MPG. On std fuel that's 54 ltr @ £1.35 (rac price) £72.90
Premium say £1.46 £78.84
£6.00 (rounded up from £5.94) so call it 4 ltr. Do you think that you will get 4.5 better MPG on the premium fuel? Never mind the extra cost of the redex.

You will better better mpg drafting behind a artic @ 56 mph 🤦‍♀️😂

AdrianC

peter3hg said:

AdrianC said:

peter3hg said:

AdrianC said:

Enough fuel. That's it.

You don't say what "1.6l 7-seater", but very few will have a knock sensor to allow the ignition map to change, so can't take any benefit from the higher octane. If it's turbocharged, then there's a slightly higher possibility.

I'd be amazed if you could find a mainstream petrol car engine from the last 20 years that didn't have a knock sensor. They all use them so they are protected if ran on lower octane fuel.

<looks out window>
There's one!

What engine is this then?

I'd be curious to see what method they use for knock detection.

They don't.

Fiat 1.2 8v FIRE, 2005.

peter3hg

AdrianC said:

peter3hg said:

AdrianC said:

peter3hg said:

AdrianC said:

Enough fuel. That's it.

You don't say what "1.6l 7-seater", but very few will have a knock sensor to allow the ignition map to change, so can't take any benefit from the higher octane. If it's turbocharged, then there's a slightly higher possibility.

I'd be amazed if you could find a mainstream petrol car engine from the last 20 years that didn't have a knock sensor. They all use them so they are protected if ran on lower octane fuel.

<looks out window>
There's one!

What engine is this then?

I'd be curious to see what method they use for knock detection.

They don't.

Fiat 1.2 8v FIRE, 2005.

That engine has a knock sensor so they do.

https://www.99rpm.com/fiat/ignition-system-1-2-fire-punto.html

https://www.daytonagblimited.co.uk/knock-sensors/361-fiat-lancia-knock-sensor-46538111-55190562-.html

AdrianC

peter3hg said:

AdrianC said:

peter3hg said:

AdrianC said:

peter3hg said:

AdrianC said:

Enough fuel. That's it.

You don't say what "1.6l 7-seater", but very few will have a knock sensor to allow the ignition map to change, so can't take any benefit from the higher octane. If it's turbocharged, then there's a slightly higher possibility.

I'd be amazed if you could find a mainstream petrol car engine from the last 20 years that didn't have a knock sensor. They all use them so they are protected if ran on lower octane fuel.

<looks out window>
There's one!

What engine is this then?

I'd be curious to see what method they use for knock detection.

They don't.

Fiat 1.2 8v FIRE, 2005.

That engine has a knock sensor so they do.

https://www.99rpm.com/fiat/ignition-system-1-2-fire-punto.html

https://www.daytonagblimited.co.uk/knock-sensors/361-fiat-lancia-knock-sensor-46538111-55190562-.html

Well, well, well.

Pass me those orthopaedic shoes so I can stand corrected.

Bet the base map is 95, though.

Ectophile

I would fill the tank with supermarket fuel.  It's cheaper.  And it will comply with the same standards as the expensive brands.

ontheroad1970

Ectophile said:

I would fill the tank with supermarket fuel.  It's cheaper.  And it will comply with the same standards as the expensive brands.

Not always.  Where I live the supermarkets are more expensive than Texaco.  I have fed it back and they do check the local area, as when Texaco matches Tesco, Tesco puts its price up by a penny a litre.  They live off this assumption that they are the cheapest.  They are much of the time, but certainly not all of the time.