The Official Honda GROM Fill-up Report Thread - Page 2 - Honda Grom Forum
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post #11 of 32 Old 08-28-2013, 10:54 PM
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That's awesome guys! You say that you've been riding them pretty hard, what have you maxed it out on? I assume these are only really safe for small towns or innercity driving? Wouldn't mind one to run the few miles to my work and back. Does anyone know if panniers and/or top case have been added to anyone's Grom?
Search for the top case thread on the forum. A guy fitted a rear case already but he hasn't reported how it changed riding the bike. It would certainly lower your top speed though...

So far tucked in with my airbox mod I've seen 66mph. I just started a thread about my recent highway riding here in Kansas City. Here's the video of it.

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post #12 of 32 Old 08-29-2013, 12:35 PM
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Search for the top case thread on the forum. A guy fitted a rear case already but he hasn't reported how it changed riding the bike. It would certainly lower your top speed though...

So far tucked in with my airbox mod I've seen 66mph. I just started a thread about my recent highway riding here in Kansas City. Here's the video of it.

Honda Grom on the Highway - YouTube

Fantastic Video .... Thanks for the 1st person!!

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post #13 of 32 Old 08-30-2013, 11:08 AM
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I think I'd get run down on my commute on a grom. 66 mph would be dangerous around here.
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post #14 of 32 Old 08-30-2013, 12:29 PM
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1st four fill-ups testing

180 lbs., 2385' elev., 86 octane NON-ethanol regular.
Factory shift points. (basically up at 4000 rpm & down at 2000 rpm)
I know; none of you do that - but this is break-in and testing.
Fill at start and end of each test to just touching nozzle stop.

Test #1: 120 miles, back country roads - 68 miles varying rpm not above 4000
then 52 miles not above 5000. --- 165 mpg. ---

Test #2: 98 miles, same roads, 4th gear varying up and down from
4000 rpm to 6000 rpm. --- 132 mpg. ---

Test #3: 110 miles, back roads, and some highway,
up to 55 mph WOT(61mph at full tuck) --- 117 mpg. ---

Test #4: 59 miles, back country roads, and city driving. 4th gear mostly 25 to 30 mph
with up to 35. --- 160 mpg ---

Next up is testing 35-40, 40-45, 45-50 to see at what point the fuel mileage
drops off from "unbelievable", to just "wow", and down to just "great".
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post #15 of 32 Old 09-02-2013, 08:50 AM
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I think I'd get run down on my commute on a grom. 66 mph would be dangerous around here.
It would if you insisted on riding in the middle or passing lane. In the right-hand lane it would be perfectly safe at 55 mph. In fact, often around cities, you can't even go 55 mph due to congestion. Lots of slower drivers in the right lane...buses, big trucks, vans, old people, old cars....me. It's actually safer than that scenic country road with no passing, no improved shoulder, deer, etc. My experience is that people generally only remember the fastest leg of their commute. They forget about that bumper to bumper or stopped traffic....Austin, TX is a good example. Your average speed through Austin may be about 40 mph due to heavy stop and go traffic. A Grom would do just fine. The good news is the Grom gets up to speed nicely. The interstate would be fine here.
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post #16 of 32 Old 09-02-2013, 03:37 PM
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Default Fuel mileage tests 5, 6, 7, and 8. - Post break-in.

180 lb. rider, 2385 elevation, 87 octane Non-ethanol regular unleaded,
factory shift points, each test over same 62 mile course, fill to just
touching fuel nozzle crossbar. Five miles in town to open road; then
only 7 stop signs in 50 miles, then back in town.

test #5: constant 30 mph. ---157 mpg---

test #6: constant 35 mph. ---147 mpg---

test #7: constant 40 mph. ---138 mpg---

test #8: constant 45 mph. ---115 mpg---
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post #17 of 32 Old 09-02-2013, 04:02 PM
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Default My findings and conclusions

Although I got 160 mpg staying between 25 and 30 mph;

147 would be the highest reasonable mpg expected. Think 30 year old
female teacher or nurse riding gently 5 or 10 miles to work on a flat
35 mph road.

For each 1 MPH over 25; you lose 2 MPG up to 40 mph.

From 40 mph up; for each 1 MPH increase; you lose at least 4 MPG.

Will not hold 55 mph on even a very slight incline.

Will not hold 45 mph on a medium incline.

So 45 mph roads (50 if flat) will be my limit until I revisit the test
after JT etc. sells a 1T larger front or 3T smaller rear sprocket.

Of course YMMV (pun intended)
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post #18 of 32 Old 09-05-2013, 01:53 PM
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I've gotten about 105 out of my first tank. I now have a Tyga exhaust and a MOD'd air box. I'm curious to see what will change if any.

Have 10 mm will Travel.

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post #19 of 32 Old 09-09-2013, 07:17 PM
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155 lbs
6' tall

I bought in a can, exactly 1.5 US Gallons, 93 octane (only because my car demands it and I might as well fill up, ya know?)

I am at sea level
I am a former racer and I ride hard. Hard throttle, hard braking. Every ride is a race.

I am now at exactly 100 miles and just went to the final bar, not sure if that thing in it turns red or not, but I do remember reading reserve is .38 Gal....so, assuming I am a little over reserve, say a half gallon, I got about 100 miles on a gallon
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post #20 of 32 Old 09-17-2013, 01:07 AM
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pretty much went wot straight from the dealership and got 109 mpg from my first tank. just installed a pipe anddid the airbox mod so ill see if helps or hurts the mileage any.

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