Factory fuel consumption ratings for this engine in VL Commodore's are, Manual = 1295kg's Kerb Weight, Fuel type 91 RON ULP Fuel tank capacity (litres) 63 City 10.5 Highway 7.4 Auto = 1325kg's Kerb Weight, Fuel type 91 RON ULP Fuel tank capacity (litres) 63 City 11.5 Highway 7.4 I have a 5spd manual, car weigh's 1172kg's, 2.5" exhaust no cat and a cold air intake, and i get on average about 1L worse than factory fuel consumption, however i have got slightly better than factory with sadate driving,

having no catylic cnoverter will make your fuel economy worse

Quote: Originally Posted by TRb30ett Factory fuel consumption ratings for this engine in VL Commodore's are, Manual = 1295kg's Kerb Weight, Fuel type 91 RON ULP Fuel tank capacity (litres) 63 City 10.5 Highway 7.4 Auto = 1325kg's Kerb Weight, Fuel type 91 RON ULP Fuel tank capacity (litres) 63 City 11.5 Highway 7.4 I have a 5spd manual, car weigh's 1172kg's, 2.5" exhaust no cat and a cold air intake, and i get on average about 1L worse than factory fuel consumption, however i have got slightly better than factory with sadate driving, how accurate are these figures, as others would say that they should be higher at approx 11ltr/100 hyw , whereas my VL's figures work out at approx 9.6ltr/100 hyw using 3.08 diff gearing which is fine on the open road not that thrilling in city driving, where as my second VL geared at 3.45 has figures of approx 11.7ltr/100 hyw but does better in city driving than my first VL. Going by the above quoted figures 7.4ltr/100 that would work out approx 850 k's to 63ltr tank, I could only dream of figures like that. As i do huge km's travelling interstate all year I choose the VL that gives the better comsumption, long hyw runs for one , and use the other when doing more city driving.

"having no catylic cnoverter will make your fuel economy worse" I had the choice of either 2 mufflers or 1 muffler and a cat - i choose the 2 mufflers as my car was deafening when standing outside, and pretty awful inside - the noise felt like it was getting into your head - so i ditched the Cat and installed a 2nd muffler, vl power, Well for me, i have 3,9:1 diff gears and my fuel consumption is close to what the "factory" fuel consumption figures say i should be getting for city driving, sometimes worse, sometimes better, i havent really driven my car much on the highway though,

removing the cat means removing emmissions devises, and is a big fine, just get a high flow, than its legile and it will flow