ready for nelson......

OK.....I finally decided to get the nelson tune, but before I do I was just wondering how much kilometres would I say get extra per tankful..... In other words, with my mods....(air intake...ahh, transmission cooler, don't think that makes a difference, corvette servo, probably neither does this....I think that's it)... and putting it on the mileage tune.....how many kilometres would I get on top of the 500 kilometres I get now......This is with light driving and no towing.... Thanks ahead of time......

I've only had mine for a couple days, so I can't really comment. Allen told me between 1.5 MPG and 1.8 MPG difference. The servo seemed to make a little MPG difference.