Archives

Hi everyone I am new to the hypermiling, I have a 95 eclipse 5 speed manual w/ a 2.0L 4cylinder. What kind of mileage do you guys think is possible without some of the more hardcore things like aero mods and such. I had been getting around 30mpg first few tanks of gas before trying harder for good mileage which then led me to my best tank of almost 39mpg so far. I just got a kiwi mpg guage, today is the first time I was using it and although it is definatly not calibrated yet, I realized when I am driving a steady speed on the highway it will say around 40mpg then I will let off the gas and coast it will go up to 80mpg or so but then if I push the clutch in or put it in neutral it will drop to 25-30mpg, why would it show 25-30mpg when coasting at 55mph when engine is idleing but show 80mpg at same speed with engine at a higher rpm? Is this a problem with the kiwi? Do you scanguage guys have this problem at all? My car does not have a maf it uses a map sensor so I know this will sometimes mess with things of this nature but I do not know.

Since www.fueleconomy.gov (http://www.fueleconomy.gov) lists it at 21/29 - I'd think this summer you could do 35 or 40 mph from driving techniques

Hi everyone I am new to the hypermiling, I have a 95 eclipse 5 speed manual w/ a 2.0L 4cylinder. What kind of mileage do you guys think is possible without some of the more hardcore things like aero mods and such. I had been getting around 30mpg first few tanks of gas before trying harder for good mileage which then led me to my best tank of almost 39mpg so far. I just got a kiwi mpg guage, today is the first time I was using it and although it is definatly not calibrated yet, I realized when I am driving a steady speed on the highway it will say around 40mpg then I will let off the gas and coast it will go up to 80mpg or so but then if I push the clutch in or put it in neutral it will drop to 25-30mpg, why would it show 25-30mpg when coasting at 55mph when engine is idleing but show 80mpg at same speed with engine at a higher rpm? Is this a problem with the kiwi? Do you scanguage guys have this problem at all? My car does not have a maf it uses a map sensor so I know this will sometimes mess with things of this nature but I do not know.

Probably Idling at a higher RPM than when in gear. Most car's actually turn off the fuel injectors when in gear and letting off the gas. With my wife's car for P&G i actually turn the car off on the glides and pop the clutch for the pulse. Much better efficiency that way as there is no fuel used while gliding. Can't do that with my smart at there is no clutch.

I think I might be having a vacuum leak which I am wondering if that is causing any problems getting readings because of my map sensor that is controlled by vacuum. I did some more experimenting today and coasting downhill in gear would read anywhere from 80-120 mpg depending on speed and grade of the hill, but every time it would read that high I would hit the clutch and the number would drop down to 30's maybe 40 at most, then if I continued to hold clutch in but rev the engine up to around 2k the mpg would jump up to 70mpg or so and upon letting off the gas the rpm would drop back to around 900 or so and the mpg would drop right back down in the 30's again.