cams and a schrick low 20's ok i say! you need to identify the fault codes, blue temp sendor can cause it to overfuel if its duff for example... Schrick head, 2.9 low comp bottom end, schrick 268 cams, 3.68 final drive, bmc, stealth ramap, 6 branch, de-cat, miltek exhaust from memory. start at the basics I.E addressing fault codes and a good service if not done already... if your worried about MPG then i wouldnt modify it any more