I think the D-40 is the better of the planes for ground attack and not just because I'm a Jug geek. It hauls more ord and (thanks to the new damage model) will absorb more ack hits allowing more passes with less likelihood of critical damage. I think it's every bit as capable as a fighter once light as any P-38 as well. The ony advantage the p-38 has is the ability to get to initial altitude quicker. Once on the attack run, the jug doesn't compress as quickly as the 38 so the zoom on the back side will get you the same or better E retention. A couple weeks ago, I took a D-40 on an ammo bunker attack to slow down the Bish. I loaded 3 500s, some rockets, and 75% fuel and set off. My target was a medium field where bombers were departing but away from the main thrust of Bish attacks. I had to make four passes through the ack to get the ammo bunkers and the radar. It normally only takes me 2 or three, but my aim was off and I missed with two of my eggs and had to use guns to polish off two bunkers. After taking hits but no damage, I proceeded to a small adjacent field and gunned down those ammo bunkers as well. Still taking ack hits but no damage. Fuel was becoming an issue but I decided to press my luck and head to the main base where most of the enemy was departing. I arrived at the base with 7 minutes of fuel and gunned down the two ammo bunkers there. This time I lost an aileron and a gun making my pass. A Spit-16 came out to meet me and I got tied up fighting him for a couple minutes before I was able to kill him. Now I was fuel critical and had a Typh running me down before I could recover some speed from the fight with the spit. I managed to make the Typh overshoot and was pumping the last of my ammo into him when the fuel ran out. I ended up ditching and giving the Typh the proxie.
In one run, I made 8 passes through field ack, destroyed 8 ammo bunkers at 3 fields, one radar tower, killed a spit, damaged a Typh and didn't RTB only because I didn't load 100% fuel.