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slowmover · 07-20-2019, 10:27 AM

1). It is harder to move the average once established over many miles.

2). Easing along near dark with A/C on isn’t the penalty it would have been at mid-afternoon.

3). Given a vehicle well-warmed up that day (45+ miles), THAT particular penalty is in abeyance.

Having window covers (interior) is a real help. I’ve made quite a few from 4’ tall rolls of REFLECTIX. As with a cold engine needing time/distance to warm up, ANYTHING that reduces heat load into the interior pays for itself.

Strictly speaking, no, there won’t be “better” fuel mileage with HVAC use. Reducing the penalty is the game.

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07-20-2019, 10:27 AM	#8 (permalink)
slowmover Banned Join Date: Oct 2009 Location: Fort Worth, Texas Posts: 2,442 2004 CTD - '04 DODGE RAM 2500 SLT Team Cummins 90 day: 19.36 mpg (US) Thanks: 1,422 Thanked 737 Times in 557 Posts	1). It is harder to move the average once established over many miles. 2). Easing along near dark with A/C on isn’t the penalty it would have been at mid-afternoon. 3). Given a vehicle well-warmed up that day (45+ miles), THAT particular penalty is in abeyance. Having window covers (interior) is a real help. I’ve made quite a few from 4’ tall rolls of REFLECTIX. As with a cold engine needing time/distance to warm up, ANYTHING that reduces heat load into the interior pays for itself. Strictly speaking, no, there won’t be “better” fuel mileage with HVAC use. Reducing the penalty is the game. .