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High fuel consumption FIXED 700

posted by  Neills740Turbo on  Tue Jul 17 21:57 CST 2007
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last visit: Tue Jun 29 01:10 CST 2010
[RELATED]

Hi all

I thought i would post this as others might have the same problem.

I have an 1987 740 turbo with a b230ft LH 2.2, i have had a fuel economy problem for as long as i owned the car, i had everything replaced from the pumps to the injectors, FPR, and resealed eveything, new turbo plumbing and intercooler, k and N airfilter, new AMM, and a new ECT, and tuned the air fuel mix, Which made no difference. till about 1 weeks ago when the local fuel station ran out of my usual fuel Premium Unleaded 95 octane, so i resulted in putting standard unleaded 91 octane.
So after driving around i found out that my fuel consumption went down to 11L/ per 100ks in the city, and 8L/ per 100ks this right on factory fuel consumption, Compared to my normal consumptio of 13L/100 in town 11L on the highway.
So I ended up doing alot of drivng around town, and on the open road to see if this is true. About 200ks in town and a long highway trip of about 2000ks in total.

Could any body please tell me why this is. I thought premium is meant to give me better fuel consumption

P.S found that using 98 octane made is use even more 15L/100 in town and 12L/100.

Thanks
Neills740turbo

Volvo 87 740 turbo 318k
85 740 GL Sedan 380k
90 740 GL wagon 285ks






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