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I note many questions about mpg with HUMMERS. Having put about 3,000 miles some months on turbo, non turbo, and gas engine HUMMERS my experience is:
These figures with multiple tank fills with care on fill level being checked and mileage checked carefully. Though not scientific, it is close to reality. NOTE: Big block Chevy Suburbans and other makes will not get better fuel economy - most people do not do consistant multiple fill checks for overall mileage.
I agree with all the numbers except the gas one's. When I had my gas truck I would get 7 mpg in the winter around town. 8.5 around town in the summer and the best I ever got on the road was 12 going 60 mph. Usually I would get 11 mpg on the road. The only time I got numbers as low as 3.8 was when I was off roading.
Concerning fuel mileage with our non turbo diesel.
10 TO 11 MPG PULLING OUR TRAVEL TRAILER UP AND DOWN MOJNTAIN PASSES WITH A GCW OF ABOUT 13,500 POUNDS (1000 lbs under the rated limit)
15mpg highway without trailer using sane legal speeds.
Exploring the outback on dirt roads (15 to 20 mpg)
Hmmm... I own a 95 gas wagon and over my year-and-a-half experience (around 17k miles) during which I consistently tracked and calculated fuel economy at every fill-up (and there are a LOT of 'em in there, believe me), I have never realized less than 9 mpg for a single tank of gas. While I haven't carefully tracked fuel economy at different speeds, the overall average sits somewhere between 10 and 11 mpg, with a high watermark at around 13.5.
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