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MG Midget and Sprite Technical - Best fuel

Hello,
On a 1275 with leaded head,and using a lead replacement,which is the best fuel to use.

Thanks for looking Wayne.
W Williams

The petrol you can afford!

I would not bother with lead replacement as our cast iron heads are rather hard to begin with.

As long as your engine is std it should be able to cope with ron 95 fuel.
When anything is modded (higer cr) ron 98 is the drill
Onno Könemann

Tesco's 99 is a good combination of price & quality
David Smith

Cheers , Wayne.
W Williams

With higher octane number, you should be able to advance your ignition a few degrees ... this ought to lead to greater economy. When I used "super" in my MGB, I got about 7% more mpg but the price differential was about 4-5% so it worked out cheaper.
Geoff E

That's interesting Geoff

I would suggest that advancing the timing of course also advanced it at cruising High vacuum RPM. That I would have thought was responsible for your far better fuel consumption. Probably your distributor could be recurved to achieve that advance at cruising revs (Vacuum) and achieve the same consumption figure without the need to advance the full timing (At low vacuum heavy throttle) and so should then run on 95ron fuel.

Really higher octane fuel ought to simply allow a higher CR engine and thus a more powerful engine. Other than mentioned ithout changing anything there would be simply no point in buying it.
Robert (Bob) Midget Turbo

Hi Bob

I had no vacuum advance at that time.

I've a feeling higher octane fuel is slightly denser, so you actually get more for your money anyway, but his will be very marginal I would imagine.

You can save money here http://www.petroldirect.com/index.htm
Geoff E

Ah no vacuum advance, no problem it is not suprising that you got far beter fuel consumption. Probably cheaper to invest in a vac unit. :)
Robert (Bob) Midget Turbo

NMC but I have ran the wife's Polo GTI on normal unleaded and it returned 40mpg on the daily commute. In the last 2 weeks I've put super in (only 97ron) and on the same commute, 43mpg for roughly £1.20 extra per tank. Thats an extra 30+ miles per tank for £1.20! Bargain! (its quicker to pick up low down too)

Steve
Steve H K-ser

This thread was discussed on 15/04/2011

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