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First of all you can completely disable the ability to go into vtech. Do you need or want vtech? You could also probably install a switch which will turn the ability on and off in case you got in a bind and needed the extra power for safety of just for pleasure. Second, there are just too many issues that could be at play here. The cold turns my DX into a gas hog. There are just too many potential issues. Try to modify your driving and review the results.
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