Unfortunately the fuel economy figures aren't so stellar. We assumed they would suffer due to the performance tunes, larger lift, aggressive tires, and wider body, but not quite as much as they are reporting. While the Duramax Z71 we tested last September returned figures between 20 and 29 mpg, the EPA is estimating the ZR2 will achieve just 19 mpg city and 22 mpg highway with the diesel, and 16 mpg city, 18 mpg highway with the gas motor. Strangely though, several journalists on the trip, myself included, saw fuel economy averages of mid-20s on the highway, with a total average around 20 mpg after a full day of low range and highway use. This left us wondering what the real world highway averages would be over time. Assuming though that the reported figures are right, these numbers compete closely with the TRD Pro Tacoma, which carries an EPA rating of 17 mpg city, 20 mpg highway