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i have the greddy kit, and i've been getting 20-22 in town, 29-30 on the HWY....better mpg on both then i was getting before. that is, as long as i don't run it too hard.
If you're going by the MPG you read on you combination gauge and you don't have a reflashed ECU that takes into account the larger injectors it is wrong.
The ECU has no way of knowing you're running higher fuel pressure or you have a greddy emanage controlling larger injectors. The only way to properly figure it out is to do it the old fashioned way. Divide how many gallons you burned through in how many miles you drove.
19mpg city and don't drive enough highway to give. I have the greddy TT with TS ecu and 380cc injectors. MPG was based on to fill ups not the gauge pod info