I have after markte 18's. HP Design rims.
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Find out the tyre size of the federals and the tyres you had before. Could be the added unsprung rotational weight causing your increased fuel consumption.
Yes, heavier tyres have more effect than mods on fuel consumption, (except the ebay chip. ebay chips will increase fuel consumption like crazy).
3000-4000 for normal driving is considered high. I shift at 3000 for the first 3 gears and then 2500 for the remaining 2. 6th is only for cruising on free ways.
My fuel consumption has improved a bit since my mods. The biggest difference was the Jtune reflash, but bear in mind i have to use 98 ron.
I recently got 800km from a tank, could have done better but i dont back off. Also got an average of 5.9l/100km 2 months ago on a 100kph average trip.
Im averaging about 7.7 l/100km which is about 740kms a tank on 100% highway sitting on about 120kph in 110kph zones.
In town im a lot heavier with the right boot and am getting 9.5 l/100 going at it enthusiastically. I think a town rate of 8.5 would be easy.
The euros great on fuel. I do run 40psi in the fronts 38psi rears, im lowered, I have a comptech CAI and headers and a hi-flow cat plus mild Jtune.
At these consumption rates I can'y justify selling my car and getting a diesel.
I have to read my manual, because this new CU2 is supposed to have shiftlight to tell you when to shift to be most fuel efficient. I'll have to post my findings....