Hydrogen-Powered Efficiency H2 Hummer's Unbelievable MPG

The H2 Hummer on average gets 16 MPG on the highway and about 12 MPG in the city. The newer H2 Hummers get slightly better gas mileage than the ... Fuel economy is nearly nonexistent. At 12 mpg for combined driving, there's no point to even mention it. Advertisement. Then there's the ... ... this platform. Combine that with improved shift patterns, towing capabilities, throttle response and even fuel economy in many cases and you'll have wh. I'd say H2s average about 12-13 mpg at most. Big heavy vehicles with an engine that isn't known for mileage. Good engine, just not built for fuel mileage. Hummer H2 MPG · 2007 · 10.3 Avg MPG · 6 Vehicles · 116 Fuel-ups · 25,534 Miles Tracked; View All 2007 Hummer H2s. How do the HUMMER H2 and HUMMER H3 compare? Use our comparison tool to see over 140 data points, including price, trims, reliability ratings, mpg, rankings, ... Best Answer. 10 to 12 mpg. Hummer H2s have horrible fuel mileage. 6 people think this is helpful. H2 is slightly higher in gas (10 - 14 mpg compared to 15 - 20 mpg) - BUT FX35 is higher insurance, and probably higher maintenance - which ... Much has been made about the deplorable gas mileage of the Hummer H2, but the H2 is a terrible truck that pales in comparison to its military- ... We put our own Big Green and Hummer H2 against each other on our highway mpg loop. Both of these trucks have been updated to be, or are in process of being, ...