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IAL Product Planning and Engineering Support Manager, Colin White, said Isuzu's engineers had identified and implemented a number of enhancements to the Giga range during their years of testing in Australian conditions.
"We recognise that there's always room for improvement - on the fuel economy front, we've made several refinements to the Giga range designed to deliver a marked improvement in that respect," Mr White said.
"We've revised the engine control software of the Giga range to enhance fuel efficiency at low engine speeds, adjusted the rear axle ratios on some models to provide low RPM at cruise, and modified shift strategies in the transmission software to reduce average engine RPM.
"And the reprogrammed engine software has adjusted the 'sweet spot' so optimal fuel economy is reached at lower engine RPM, and over a greater operating range.
"To take advantage of this change, axle ratios were revised on some models to reach optimal fuel efficiency when cruising at 100kmh.
"The shift points on the AMT have also been adjusted downward in the engine operating range on both 12 and 16-speed models."
Three 'highway' variants have been introduced to the CXY 455 18-speed and CXY 455 Premium models.
These variants are fitted with Michelin Energy Tyres to reduce rolling resistance and fuel consumption while minimising cabin noise.
"This latter point will be music to the ears of drivers on highway and distribution runs. Less friction on the road equals less tyre noise and an even quieter cabin, which I'm sure our highway operators will appreciate," Mr White said.
Isuzu's flagship 510hp Gigamax is now being offered in a 'general purpose' variant, the EXY 510 GP.
This model is engineered to deliver greater fuel economy in single-trailer and B Double applications thanks to the reduced axle ratio and Michelin Energy Tyres.
For operators eager to squeeze even more out of their Isuzu Giga at the diesel pump, a range of aerodynamic accessories is available to reduce drag and fuel consumption.
"We always recommend that operators consider adding the full complement of aerodynamic accessories to their Gigas as this can reduce drag by up to 15 per cent and deliver significant fuel savings," Mr White said.
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