blobbish

I've been FI for a number of years now but I do a number of Cannon Ball type runs and the range on the internal Computer is always well out.

This is usually not so much of an issue but this year we we're running around the French Alps and Petrol stations with 98ron (UK) are few and far between. The mileage range when full is 138 and with 6 dots reads 38, this is not accurate and I wondered if any of you guys with larger injectors have been able to change the onboard computer to make it more accurate.

Thanks in advance.