routier1642
Member
- Joined
- Feb 19, 2014
- Messages
- 320
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- Age
- 64
- Location
- Australia
- Members Ride
- 2005 Adventra LX6
I've usually run 95 or 98 RON in my Adventra LX6, to keep the engine clean, and to try to get better economy.
I had an ECU tune (by the guy who is reputed to be the gun at this), and asked about whether it could be tuned to run optimally on 95 or 98.
"It'll be tuned to whatever's in the tank", I was told.
Since the tank as full of 95 RON at the time, I thought that was OK.
Experience later showed that the ECU tune noticeably improved power and response, but did nothing for the fuel economy.
Sometime later, I tried a tank of 91, and to my surprise, although there was a little less oomph, the economy was measurably better overall.
Judging from the instant economy readout on the dash, it seems that running with 91 uses a *lot* more fuel than with 95 or 98 when I'm accelerating or powering uphill, but a bit less when I'm dawdling along at, say, 60 on the level, or cruising along at highway speeds.
A tank of 91 is cheaper, and gives me, on average, an extra 50 km or so.
I know that the Alloytec was designed to run on 91, but this doesn't seem to make sense.
Shouldn't I be getting better economy from a higher octane?
Maybe it's a quirk of my driving style or my particular Adventra (In addition to the tune, I have some small mods - a Growler CAI & a manifold insulator)
Has anyone else had an experience like this?
I'm puzzled.
I had an ECU tune (by the guy who is reputed to be the gun at this), and asked about whether it could be tuned to run optimally on 95 or 98.
"It'll be tuned to whatever's in the tank", I was told.
Since the tank as full of 95 RON at the time, I thought that was OK.
Experience later showed that the ECU tune noticeably improved power and response, but did nothing for the fuel economy.
Sometime later, I tried a tank of 91, and to my surprise, although there was a little less oomph, the economy was measurably better overall.
Judging from the instant economy readout on the dash, it seems that running with 91 uses a *lot* more fuel than with 95 or 98 when I'm accelerating or powering uphill, but a bit less when I'm dawdling along at, say, 60 on the level, or cruising along at highway speeds.
A tank of 91 is cheaper, and gives me, on average, an extra 50 km or so.
I know that the Alloytec was designed to run on 91, but this doesn't seem to make sense.
Shouldn't I be getting better economy from a higher octane?
Maybe it's a quirk of my driving style or my particular Adventra (In addition to the tune, I have some small mods - a Growler CAI & a manifold insulator)
Has anyone else had an experience like this?
I'm puzzled.
