General Motors intends to make its full-size sport utility vehicles able to burn ethanol-based fuel. Starting with the 2002 model year, its full-size SUV models that use the 5.3 litre V8 engine -- the Chevrolet Suburban and Tahoe and the GMC Yukon and Yukon XL -- will be built to run using a fuel mix of up to 85 percent ethanol, which burns cleaner than other fuels. The same modifications will be made to the Chevrolet Avalanche, a four-door pickup with SUV traits, in the 2003 model year. Combined with the ethanol-ready compact pickups GM already sells, the company said it would build one million ethanol-ready trucks by 2003.