X-Pro 150cc // Vader 150 // Lifan 150

ProDigit · 08-11-2024, 08:01 PM

With the gears completely maxed out at 19/29t, and the rear tire increased by one size from 130 70 12 to a 140 70 12, resulting in 53% higher gearing, I did an mpg run on a fairly consistent road, doing between 25-40mph the majority of the ride (most was between 30-35mph), in 5th gear (3-4k rpm) with an occasional stoplight or two.

It was a 45 mile trip to, and 45 miles back.

The mpg recorded was 89mpg, and that was very stingy, as I filled up the tank with more than was in it in the last tank.

I feel the bike now gets up to 50mph GPS more easily, because the bike accelerates much better below 5k rpm.
There's something about the intake, I guess, or resonant frequencies, that cause the engine to have less power between 5-6k rpm. Almost as if the engine gets much less air or something. Could be the length of the air intake, and carburetor, but I don't really know.
Anyway, the bike is much more suitable for cruising below 50mph, which is what 90% of my rides are around here anyway.

I'm happy to get over 80mpg on this thing, though the riding style doesn't accurately represent most of my rides.
The high mileage is mostly to thank for keeping the revs below 4500rpm.
Gas mileage goes down at around 5k rpm cruising (50 mph GPS) as this is wide open throttle.
I'd have to tuk, and then it'll accelerate to beyond 60mph in 5th, or downshift to 4th, where I can reach 60-65mph easily, before upshifting to 5th gear.

During the ride, Even with the significantly better padded seat and raises handlebars, I still managed to get sore shoulders and back.

I did the same ride on my Lifan Xpect, at an average of 5mph faster, and will see mpg numbers probably around next weekend.

08-11-2024, 08:01 PM	#39
ProDigit Join Date: Aug 2013 Posts: 245	With the gears completely maxed out at 19/29t, and the rear tire increased by one size from 130 70 12 to a 140 70 12, resulting in 53% higher gearing, I did an mpg run on a fairly consistent road, doing between 25-40mph the majority of the ride (most was between 30-35mph), in 5th gear (3-4k rpm) with an occasional stoplight or two. It was a 45 mile trip to, and 45 miles back. The mpg recorded was 89mpg, and that was very stingy, as I filled up the tank with more than was in it in the last tank. I feel the bike now gets up to 50mph GPS more easily, because the bike accelerates much better below 5k rpm. There's something about the intake, I guess, or resonant frequencies, that cause the engine to have less power between 5-6k rpm. Almost as if the engine gets much less air or something. Could be the length of the air intake, and carburetor, but I don't really know. Anyway, the bike is much more suitable for cruising below 50mph, which is what 90% of my rides are around here anyway. I'm happy to get over 80mpg on this thing, though the riding style doesn't accurately represent most of my rides. The high mileage is mostly to thank for keeping the revs below 4500rpm. Gas mileage goes down at around 5k rpm cruising (50 mph GPS) as this is wide open throttle. I'd have to tuk, and then it'll accelerate to beyond 60mph in 5th, or downshift to 4th, where I can reach 60-65mph easily, before upshifting to 5th gear. During the ride, Even with the significantly better padded seat and raises handlebars, I still managed to get sore shoulders and back. I did the same ride on my Lifan Xpect, at an average of 5mph faster, and will see mpg numbers probably around next weekend. __________________ Last edited by ProDigit; 08-12-2024 at 08:48 PM.
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